Ok well this is my first post, im not sure how friendly you guys are to complete and utter noobs but here goes, hopefully someone will be nice 
Ok i have about 1000-1100 to spend on a new PC , maby more depending on how much i sell my laptop for (dell xps m1710) ... The main reason for me wanting to do my first build is that i play a lot of xbox 360 and want a new screen capture device, at the moment i use something called a 'hauppauge hd pvr' and i want to upgrade to a "black magic intensity pro" . So yeah the BMI pro has quite specific components that it likes and dislikes so i want the pc to cater mainly to that, rendering hd video files in sony vegas , and the odd gaming session ... other then that ill be using the pc for university work, browsing etc.
Straight from the BMI site itself :
Processor
Intel Core 2 Duo 2.5 Ghz or better
Intel i5-750 2.66 Ghz or better
Intel i7-860 2.8 Ghz or better
Verified Motherboards
Asus P5Q Pro
Intel DG45ID
Intel DQ45CB
Gigabyte GA-EP41-UD3L
Gigabyte GA-P55-UD5 (rev 1.0)
DFI Lanparty JR GF9400-T2RS
Intel X58 based motherboards are current not recommended.
Verified Systems
HP xw4600
HP xw8600
HP Z400
HP Z800
RAM
2 Gb for Windows XP
4 Gb for Windows Vista
Graphics Card
Blackmagic Ultrascope requires a graphics card that supports OpenGL 2.1 or better. The following graphic cards have been verified to be compatible:
Nvidia GeForce 9600 GT1
Nvidia GeForce 9800 GT
Nvidia GTS 250
Nvidia Quadro FX 4800
ATI Radeon HD 4650
ATI Radeon HD 4670
ATI Radeon HD 4680
ATI Radeon HD 4870
Thanks to anyone who has the time to help with this id appreciate a lot, ill be building with my uncle but hes out of the country at the moment ! thanks overclockers

Ok i have about 1000-1100 to spend on a new PC , maby more depending on how much i sell my laptop for (dell xps m1710) ... The main reason for me wanting to do my first build is that i play a lot of xbox 360 and want a new screen capture device, at the moment i use something called a 'hauppauge hd pvr' and i want to upgrade to a "black magic intensity pro" . So yeah the BMI pro has quite specific components that it likes and dislikes so i want the pc to cater mainly to that, rendering hd video files in sony vegas , and the odd gaming session ... other then that ill be using the pc for university work, browsing etc.
Straight from the BMI site itself :
Processor
Intel Core 2 Duo 2.5 Ghz or better
Intel i5-750 2.66 Ghz or better
Intel i7-860 2.8 Ghz or better
Verified Motherboards
Asus P5Q Pro
Intel DG45ID
Intel DQ45CB
Gigabyte GA-EP41-UD3L
Gigabyte GA-P55-UD5 (rev 1.0)
DFI Lanparty JR GF9400-T2RS
Intel X58 based motherboards are current not recommended.
Verified Systems
HP xw4600
HP xw8600
HP Z400
HP Z800
RAM
2 Gb for Windows XP
4 Gb for Windows Vista
Graphics Card
Blackmagic Ultrascope requires a graphics card that supports OpenGL 2.1 or better. The following graphic cards have been verified to be compatible:
Nvidia GeForce 9600 GT1
Nvidia GeForce 9800 GT
Nvidia GTS 250
Nvidia Quadro FX 4800
ATI Radeon HD 4650
ATI Radeon HD 4670
ATI Radeon HD 4680
ATI Radeon HD 4870
Thanks to anyone who has the time to help with this id appreciate a lot, ill be building with my uncle but hes out of the country at the moment ! thanks overclockers
But if you choose to have them or equivalent, make sure you get a top end power supply, as rendering requires a lot of power. Akasa do the Power Max 850W for about £110, again good value. On the processors, I am AMD through and through, so would be looking at the mid range quad cores. Motherboard, processor, heatsink/fan and ram bundles are worth looking at, about £200-300 per bundle. Ram I would make sure you get 4Gb minimum, as the more the faster lol. If I was choosing from your list this is what I would choose...Intel i7-860 2.8 Ghz or better, DFI Lanparty JR GF9400-T2RS, 4 Gb Ram and finally Dual Nvidia GTS 250 Hope that helps a little for you