After fully digesting their posts, I've put together 4 sample builds, based on the AMD Phenom II 965, the Bulldozer FX 8120, and the entry-level i3 & i5. (dual & quad, respectively).
I *think* I know which build I'm going to go with, but before I say anything I'd like to just put these out there and get some feedback from people with similar rigs to report back Crysis 2 performance (since this is our nearest benchmark) and any other sensible advice as well please.

I know there are a million other HW threads, but for a completely new build I hope you won't blame me for triple & quadruple-checking my reasoning.
* (HDDs/Cables/Fans not included here as I have those, but I'll have to get a few extras inc mouse & headset hence why I can't go all the way up to £500)
Also noting that in the UK the 488 versions of the Geforce 560ti are as much as a 570, which is why I've not included that option.

As you can see, as the CPU gets more expensive the GPU has to come down correspondingly, so this is why it's such a fine balancing act at this, admittedly low budget.
Any takers?

Just as a reminder, the stated recommended specs are;
CPU: Core i3-2500 AMD Athlon II X4 650
GPU: GeForce GTX 285 Radeon HD 5830
RAM: 8 GB OS: Windows 7 SP-1 64-Bit
Ps: I've ring-fenced £40 for the cheapest semi-decent case I can find, because after Christmas I plan to mod this 2003 G5 case to take ATX
http://img.photobuck...5emptycase1.jpg