Cases -- I really like the big Lian-Li and have a bunch of them, but I also have three Antec 900 cases and those are pretty nice at $80 no shipping until 3/10 with promo code EMCYPYR23. (You should probably subscribe to the Newegg email ads which give discount codes).
I like either Gigabyte or ASUS motherboards and would not worry about USB3/SATA6 yet. You can use an add on PCIe card for USB 3 which I discussed a few weeks ago in the storage forum -- the cards come with the WD 1 Tb ext HDDs.
Video cards -- so many great choices, pretty much any ATI 5XXX based card depending on your budget and performance needs. I like the manufacturers with a three year or lifetime warranty (like XFX).
Memory -- lots of good choices here too. I like the Crucial and G Skill, but there are other good choices.
PSU -- I usually go with pcpowerandcooling kW, but I've done a few builds with modular PSUs and they are nice to reduce clutter.

