This is just a tad over your budget at $112 shipped but this is arguably THE best overclocking 939 mobo available right now. This is almost exactly the same motherboard as the DFI nF4 Ultra-D is but it's got some locked features that you can easily mod to enable (SATA-II and SLI) and it doesn't have a second gigabit lan port. For more info on this board, go read some at
DFI-Street.
edit: btw, I'm not qualified to say this is the best one. Just saying it's an option and one of the aguably best boards you can buy according to people's posts here. I ordered this and it should be arriving tomorrow.