There are three top nForce 2 boards.
The Abit NF7-S 2.0, ASUS A7N8X Deluxe and DFI Infinity.
The Abit NF7-S is the one I would go with, it has more OC options than the two other boards, but the A7N8X has more features than the Abit board. I'm personally not a fan of DFI, but some fanboys swear by them and a said accomplished 275 FSB.. Just because the DFI board offers 275FSB doesn't mean the board can handle it