I've never had to RMA a mobo to Newegg, but I would assume they'll be reasonable. A smudge of thermal grease on the mobo, probably no problem. If it had a screwdriver gash... well, that ain't ABit's fault, so they would probably say "sorry bro, no dice" in that situation.
If you wanted a really trouble-free mobo, older but very reliable and affordable, the Asus A7N266-VM/AA is one of my bigtime favorites. We have 36 of them at my workplace now

and they're just as troublefree as pie, which is great because I'm the guy who would hear about it if they weren't. I just built 4 of our 6 newest ones over the last couple days, all with 2400+'s using the Thornton core.
The A7N266-VM/AA does need to be updated to the 1007 BIOS to recognize the Thornton-core 2400+ as such, but in the meantime it calls them a "1933MHz AthlonXP" and runs them like that. These boards are just $58 shipped last I checked, and have the full Soundstorm audio in the southbridge too.
Now, it's possible that the CPU was a casualty in all of this, so you could hedge your bets with a 1.6GHz Duron or something if you had reason to think the CPU was toastified (burn marks, chips, whatever). Not trying to be pessimistic, but it's a possibility.
edit: Let me also put in a plug for the Shuttle AN35N Ultra too, it seems to be getting good remarks by the owners and mine hasn't given me any problems either. Good overclocker, unlike the A7N266-VM/AA.