Well, overclocking with EVGA Precision, MSI Afterburner, etc. is pretty easy. Like any OC, it isn't 100% guaranteed to be stable, but most people have good results.
IMHO the build I suggested is a bit better value (even disregarding rebates, but seriously $35 for 5 minutes work, just do it). It will probably give you good performance in BF3 with no tinkering whatsoever. I say probably because benches aren't out yet, so we don't know for sure. At least no benches that I saw, somebody post a link if you've got 'em. The absolute safest thing to do would be to wait until mid-October or so so that you don't need to guess.
So there, I guess you have at least two different opinions now. :awe: