Ok, so I should explain why I chose the FX cpu and it's components.
I chose the FX-4100 because it is a 4 core CPU and it is said by many people that the benchmarking tests DO NOT reflect its actual performance and that the real world performance is better. The ASUS motherboard is AM3+ ready and is from a reputable company. The power supply is also from a reputable company AND it's more than enough for overclocking (should you wish to). The NZXT case is roomy and supports large gfx cards (I have it and it supports my Radeon 6870). The Corsair memory is low profile, meaning you can add an aftermarket Heatsink and Fan and it won't be in the way. The DVD-ROM is self-explanatory
I've gone FX for (mostly) the same reasons as roaringdragon stated.
However, beware the mobo: Asus site says FX is supported with BIOS version 0510 - be sure it has this version or get supplier to update for you.
If your old processor is AM3, no problem, you can use it to upgrade the bios if needed.
I bought this: http://www.novatech.co.uk/products/components/motherboa...
That said, if I'd had the money I would have gone i5