>Right now, although AMD might seem to be slightly more bang for the buck, go for Intel. Why? AMD is pulling out of the market, Intel is here to stay and offer future upgrades. i5 2500K is awesome and can be, if she wants, overclocked like a sweet baby (if you want to OC grab the likes of a H100 or NH-ND14 too).
>If you're looking at the price range of the 560 Ti, get the 560 Ti. Because Nvidia doesn't produce crappy drivers and have shitty support (unless you're using linux, hehe).
>PSUs should all work just fine, if you're limited with your budget you can save big time by buying one that isn't brand name (and no, they don't magically die after a week, I always stick cheapo LC Power PSUs in the builds I hand out and I've yet to get any complaints - I've even had more issues with CM).
>Caviar Black is pretty nice, Spinpoints F3 aren't that bad either (in real life performance tests they score a tad bit higher than the Caviar Blacks I think, but each have their own strengths and I always recommend both).
>Mobo shouldn't be an issue, every budget board nowadays comes with the standard features. If you're going AMD you might want to look at the 990x family, if you go Intel I recommend you buy a P67 board
>Cases: fuck NZXT, the one case I had gave me traumas. Antec Eleven Hundred if you want something gamer-ish (ie looks), Fractal Design's Core 3000 is an awesome air-cooling case that looks reasonably plain (I love it, I force it on erryone).