Hi Guys, sure you've all had this asked a lot, but I'm looking to build a new system and after some advise. Last time I built a system it had an AMD K6-2 at 200 MHz so be gentle on me 
I'm after a system which will game well, with enough graphics horsepower to look good on a 1080p projector screen (100 inch). However, I spend most of my time manipulating spreadsheets. My currnt laptop (company Dell Latitude D630) can take anything upto 45 minutes with some of the stuff I'm manipulating so I normally leave it going in the background and do other things while it works, so I'd be after enough processing to be able to game with a load of applications working away behind it.
This is what I put together as a possible system, bit worried about it having enough power and fitting into the case, I think the rest is okay. I was also thinking I might be better with 2 460s in SLi rather than the 5830s, they are more powerful, but also more expensive, how much difference would it make?
Product Name Qty Price Line Total
Krypton Intel Core i7 930 2.80GHz @ 4.00GHz Overclocked Bundle Krypton Intel Core i7 930 2.80GHz @ 4.00GHz Overclocked Bundle £387.75
(£330.00) £387.75
(£330.00)
Options applied to the above product:
Akasa AK-CCX-4002HP Venom CPU Cooler (Socket LGA775/LGA1156/LGA1366/AM2/AM3) £37.99
(£32.33) £37.99
(£32.33)
Options applied to the above product:
Gigabyte GA-X58A-UD3R Intel X58 (Socket 1366) DDR3 Motherboard £152.99
(£130.20) £152.99
(£130.20)
Powercolor ATI Radeon HD 5830 PCS+ 1024MB GDDR5 PCI-Express Graphics Card Powercolor ATI Radeon HD 5830 PCS+ 1024MB GDDR5 PCI-Express Graphics Card £154.99
(£131.91) £309.98
(£263.82)
OcUK Cream 23.6" Widescreen LCD Monitor - Black OcUK Cream 23.6" Widescreen LCD Monitor - Black £136.29
(£115.99) £136.29
(£115.99)
Microsoft Windows 7 Professional 64-Bit - OEM (FQC-00765) Microsoft Windows 7 Professional 64-Bit - OEM (FQC-00765) £113.96
(£96.99) £113.96
(£96.99)
Corsair TX 650W ATX SLi Compliant Power Supply (CMPSU-650TXUK) Corsair TX 650W ATX SLi Compliant Power Supply (CMPSU-650TXUK) £59.98
(£51.05) £59.98
(£51.05)
Seagate Barracuda 7200.12 1TB SATA-II 32MB Cache - OEM (ST31000528AS) Seagate Barracuda 7200.12 1TB SATA-II 32MB Cache - OEM (ST31000528AS) £51.69
(£43.99) £51.69
(£43.99)
Samsung SH-B083L/BSBP 8x BluRay ROM / 16x DVD±RW Drive - Black (OEM) Samsung SH-B083L/BSBP 8x BluRay ROM / 16x DVD±RW Drive - Black (OEM) £45.99
(£39.14) £45.99
(£39.14)
Coolermaster Elite 335 Case - Black Coolermaster Elite 335 Case - Black £27.99
(£23.82) £27.99
(£23.82)
Sub Total : £1,127.33
Shipping cost assumes delivery to UK Mainland with:
DPD Next Day Parcel
(This can be changed during checkout) Shipping : £20.10
VAT is being charged at 17.50% VAT : £200.80
Total : £1,348.23

I'm after a system which will game well, with enough graphics horsepower to look good on a 1080p projector screen (100 inch). However, I spend most of my time manipulating spreadsheets. My currnt laptop (company Dell Latitude D630) can take anything upto 45 minutes with some of the stuff I'm manipulating so I normally leave it going in the background and do other things while it works, so I'd be after enough processing to be able to game with a load of applications working away behind it.
This is what I put together as a possible system, bit worried about it having enough power and fitting into the case, I think the rest is okay. I was also thinking I might be better with 2 460s in SLi rather than the 5830s, they are more powerful, but also more expensive, how much difference would it make?
Product Name Qty Price Line Total
Krypton Intel Core i7 930 2.80GHz @ 4.00GHz Overclocked Bundle Krypton Intel Core i7 930 2.80GHz @ 4.00GHz Overclocked Bundle £387.75
(£330.00) £387.75
(£330.00)
Options applied to the above product:
Akasa AK-CCX-4002HP Venom CPU Cooler (Socket LGA775/LGA1156/LGA1366/AM2/AM3) £37.99
(£32.33) £37.99
(£32.33)
Options applied to the above product:
Gigabyte GA-X58A-UD3R Intel X58 (Socket 1366) DDR3 Motherboard £152.99
(£130.20) £152.99
(£130.20)
Powercolor ATI Radeon HD 5830 PCS+ 1024MB GDDR5 PCI-Express Graphics Card Powercolor ATI Radeon HD 5830 PCS+ 1024MB GDDR5 PCI-Express Graphics Card £154.99
(£131.91) £309.98
(£263.82)
OcUK Cream 23.6" Widescreen LCD Monitor - Black OcUK Cream 23.6" Widescreen LCD Monitor - Black £136.29
(£115.99) £136.29
(£115.99)
Microsoft Windows 7 Professional 64-Bit - OEM (FQC-00765) Microsoft Windows 7 Professional 64-Bit - OEM (FQC-00765) £113.96
(£96.99) £113.96
(£96.99)
Corsair TX 650W ATX SLi Compliant Power Supply (CMPSU-650TXUK) Corsair TX 650W ATX SLi Compliant Power Supply (CMPSU-650TXUK) £59.98
(£51.05) £59.98
(£51.05)
Seagate Barracuda 7200.12 1TB SATA-II 32MB Cache - OEM (ST31000528AS) Seagate Barracuda 7200.12 1TB SATA-II 32MB Cache - OEM (ST31000528AS) £51.69
(£43.99) £51.69
(£43.99)
Samsung SH-B083L/BSBP 8x BluRay ROM / 16x DVD±RW Drive - Black (OEM) Samsung SH-B083L/BSBP 8x BluRay ROM / 16x DVD±RW Drive - Black (OEM) £45.99
(£39.14) £45.99
(£39.14)
Coolermaster Elite 335 Case - Black Coolermaster Elite 335 Case - Black £27.99
(£23.82) £27.99
(£23.82)
Sub Total : £1,127.33
Shipping cost assumes delivery to UK Mainland with:
DPD Next Day Parcel
(This can be changed during checkout) Shipping : £20.10
VAT is being charged at 17.50% VAT : £200.80
Total : £1,348.23