I5 Mobo - which supports PCIe x8 for 2 cards at min

So i was building a x3 720 until this past week and now seriously considering the i5 750 build. The only thing left is the CPU, Mobo, Memory but i am confused as heck regarding the p55 mobos and what they really support in crossfire (down the road for me). I am leaning to a Gigabyte, Asus, or MSI board but which models really supports cross fire in PCie X16 for one card and at least PCIe x8 for 2 cards?
I would even consider a i7 920 if i could get the total mobo, mem, CPU near the i5 750 ( i have a microcenter with an i7 920 for $200)

Thanks for pulling me out of the abyss.

APPROXIMATE PURCHASE DATE: This week

BUDGET RANGE: say <$1k not a huge deal but don't want to be frivolus. for total system cost minus monitor

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Primarily for gaming and general use but do not want to spend the bank. Company of Heros, other RTS down the road, occasional shooter

PARTS NOT REQUIRED: just the CPU mobo, mem left to buy
PREFERRED WEBSITE(S) FOR PARTS: newegg.com

PARTS PREFERENCES: i5, i 7, or AM3

OVERCLOCKING: first timer but want to try mild or standardized OC
SLI OR CROSSFIRE: Single to start option down the road

MONITOR RESOLUTION: 1080P 22”

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