pick a coolermaster/ seasonic/antec 650w if your gonna just have 1 card if your gonna have 2 then 850w 3 1200w
but seriously if you dont need 1200w then dont buy 1200w
same with the motherboard. if your not planning on tri sli or tri fire then dont bother getting a board with more than 2 pci-e 16 slots.
also forget the small ssd. better to get 2x1tb spinpoint f3 7200rpm in raid 0 they will give anywhere up to 200mbps you get much more storage and a lot less worry... ssd's although fast are pretty unreliable in that price point... not only that the small size makes them pretty useless for anything other than boot devices.
i know a few people that have had 3-4 60/80 and 120 gig ssd's and all failed within 6 months.really there cheap in comparison to enterprise ssds because they aint all that... seriously its gonna be another 3-5 years b4 ssd's are worth the money to the average user on a tight budget as you are.
for your money you really do want the best performance and stability so you dont have to keep shipping stuff back and forth to get repaired/replaced. so stay clear of small ssd's for now.
lastly see if you can up your o.s to pro rather than premium so you can have compatibility mode. its needed especially if you play older games.