Which power supply???

I collected and bought a PC but i am not sure about power supply and case which I don't have yet. My pc components are; Asus Rampage Formula, BFG GTX260ocx, İntel p8500 3.16 Ghz(which is gonna cooled by zalman 9700 led), 2x2GB Corsair Dominator DDR2 1066 and Seagate Barrcda ES.2 500GB. How many apprximate Watts should have the supply? And also i dont know about the p.supplies componies which can give the real value they defined as manufacturer info.(for exmple, it says 500W but sometimes it cant even reach ~400W you know...) And also do you have any case with good cooling or air circulation system?? And Cases with good or enough p.supply... I wanna say that my budget is not over than 200$(actually btwn 100-150...or cheaper)

From the specs tab here: http://www.newegg.com/Product/Prod [...] 6814143148

$152 buys you a RC-690/650TX combination:
http://www.buy.com/prod/cooler-mas [...] 77908.html
http://www.buy.com/prod/corsair-tx [...] 78324.html

Thermaltake ToughPower 750W, provides 87% efficiency, and froogle search it and it can be found for under $100, and is also covered by 5 year warranty, and also it is very quiet, and runs very cool even at a full load.

Also you will get over-current protection acts like a surge protector, and in manual indicates with ToughPower models if the PSU is cause of defective equipment, it has liability to it, and will cover up to $50k. That is very impressive to me. I don't know any other PSU covers your computer if it faults out. I have had an Antec fault out, and killed the Video Card, motherboard, and processor about 1 year ago, so I don't recommend Antec, and they are load, and get pretty warm.

The Thermaltake Toughpower 750W is also SLI/Crossfire certified.