New Almost Super CPU! 2 questions thx

So I Just purchased a MSI R6870 Hawk Radeon HD 6870 on craigslist for 175$ us dollars and love it! I need to get my new build going and want to buy one more of these so i can crossfire them. For my budget i think that the i5 2500k processor is going to be my best option. Though if people think Amd can compete with chip at this price id love to hear it. Because these cards are so big i'm worried about finding a Mobo that can handle it. Also do i need it at 16x x2 ? or will i be fine with x8 x2? Also something that will keep them spread out so they stay cool thanks for any info possible. This also take me to my next Question What case is gonna be good for these two beasts? thanks again for your time!

other specs:
Windows 7 ultimate 64bit- 0$ already own
Crucial M4 128gb ssd - 210$
Samsung F3 500gb Hdd- Thailand flooding making this too high atm will check local markets.
Asus Dvd/rw dvd drive- 20$
MSI R6870 Hawk Radeon HD 6870 X2 - 200$ approx i have one
Intel i5 2500k Processor - 220$
CORSAIR Professional Series HX1050 1050W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS SILVER 220$ Or
CORSAIR Professional Series Gold AX850 (CMPSU-850AX) 850W ATX12V v2.31 / EPS12V v2.92 80 PLUS GOLD 190$
MOBO- ???
Im at about 850$ right now and would like to stay around 1200$ was thinking 250 or so on Mobo and 150$ on case thanks again.
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More about super questions
  1. Just realized i forgot about RAM lol i hear good thinks about gskill.. so maybe 3 questions lol thanks for your time
  2. CORSAIR Professional Series HX750 (CMPSU-750HX) 750W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS SILVER just read a review of this powering my gpu and cpu flawless and for 70 bucks cheaper which give me more room for better mobo case RAm!
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