MY CONCLUSION: Debian is not ready yet, and there's so little difference for our purposes between RedHat and SuSE that we should just go with the pre-install.
But... what's your opinion?
Well, given the choice, I'd say SuSE, for two reasons:
1) SuSE for AMD64 has been around quite a bit longer, so there are probably less bugs in it.
2) YaST rocks.