First Time Builder w/ $600 Please help

First time builder. building it to play GW2 and 2-3 years of current games with only minor upgrades (CPU/RAM)

I'm wondering if I'm missing something. Are my components compatable? Are there compromises I can make without sacrificing too much performance? Or better options available? I really want to buy in the next few days.

So here goes

i3-2100 $90 after mir expires 08/11
http://www.compusa.com/application [...] CatId=6983

GIGABYTE GA-B75M-D3H $75
http://www.newegg.com/Product/Prod [...] 6813128555

OCZ ModXStream Pro 700w $50 after MIR
http://us.ncix.com/products/?sku=35456

XFX HD 6870 1GB 256-bit GDDR5 $175 A/ MIR
http://www.newegg.com/Product/Prod [...] 6814150561

G.SKILL Ripjaws 2x 4gb 1600 $43
http://us.ncix.com/products/?sku=57953

Cheap Optic Drive $17
http://www.newegg.com/Product/Prod [...] 6827151255

Can't decide on a case, but it needs to be <50, less is better. I have one I can salvage but I think it's a ATX mico. It was in an E-michine BE-2350.

Salvaging a 320gb SATA HDD from previous machine, but would like to add 500gb HDD

Windows 7 home premium oem $90 Amazon
can I get it for less?

Thx for any help.