Yeah.....people just have different experiences. I have an MSI board and I have had nothing but good experience with it. The only thing it lacks is OC options. For which I would recommend an ABit board if you want lots of options. For the 939 socket I would suggest the AV8-3rd Eye from ABit, if you want MSI (which in my opinion is a good board, just not as many options) I would suggest the Neo2-Fir instead of the Neo2 platinum only because I'm partial to VIA chipsets myself and I think are a little less 'buggier' but thats just my opinion not a set in stone fact or anything.
AVOID ASUS is my strongest comment I got towards that.
And like most people have said I would also suggest you get an eVGA 6800GT they put the same heavy duty heatsinks on all their cards, not just the 6800 Ultra which means for the lesser cards you got better than stock cooling 'technically' and I've heard numerous reports of getting it to Ultra speeds quite easily. BFG produces an already OC'd out of the box brand if you want to look into that, but I still suggest the eVGA.
I would listen to kangaroo when it comes to the case selection.
Other than that, everything looks good