Don't you want to build it yourself?
Overclocking is easy these days, and you can get loads of help on here. There's no real problem with safety, if you go too high the PC won't start up and will reset itself to default clocks.
I got my 4770K to 4.5GHz by changing about two settings.

thought overclocking could result in over working you processor and blowin it out? Maybe im wrong![]()
You're very unlikely to do that.
Intel build special safeguards into these CPUs to stop them 'blowing up'. For example, the CPU automatically throttles itself if its getting too hot. In addition, most new motherboards will not allow the system to even start if they detect that you may 'blow up' the system.
The CPU will last less time, but it really is minimal.

YOUR BASKET
1 x Asus GeForce GTX 780 Direct CU II OC 3072MB GDDR5 PCI-Express Graphics Card £539.99
1 x BenQ XL2420T rev2.0 24" TRUE 144Hz 3D Vision 2.0 Widescreen LED Monitor - Black/Red /w Flicker FREE Technology £319.99
1 x Asus Z87 MAXIMUS VI EXTREME Intel Z87 (Socket 1150) DDR3 ATX Motherboard £314.99
1 x Intel Core i7-4770K 3.50GHz (Haswell) Socket LGA1150 Processor - Retail £275.99
1 x NZXT Phantom 820 Enthusiast Ultra Tower Case - Black £199.99
1 x BeQuiet Dark Power Pro P10 850W '80Plus Platinium' Modular Power Supply £191.99
1 x Asus ROG Xonar Phoebus 7.1 PCI-E Soundcard £185.98
1 x Crucial RealSSD M4 256GB 2.5" SATA 6Gb/s Solid State Hard Drive (CT256M4SSD2) £164.99
1 x Corsair Vengeance Low Profile 16GB (2x8GB) DDR3 PC3-12800C10 1600MHz Dual Channel Kit (CML16GX3M2A1600C10) £129.95
1 x Western Digital Caviar Black 2TB SATA 6Gb/s 64MB Cache - OEM (WD2002FAEX) HDD £128.99
1 x BeQuiet Dark Rock Pro 2 CPU Cooler £61.99
Total : £2,541.47 (includes shipping : £22.20).
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You could just get:
YOUR BASKET
1 x Gigabyte Z87X-D3H Intel Z87 (Socket 1150) DDR3 ATX Motherboard £131.99
Total : £139.73 (includes shipping : £6.45).
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This supports up to two GPUs (so SLI) and will also allow you to overclock just the same as the OC board.
at much higher Overclocks on that board you will start to struggle to get it stable due the phases just have nothing more to give, the OC board has more phases and better VRM power delivery (that said your not likely going to do it on air).