> Speed? Should make no difference at all. Lennard Jones + Coulomb on 
> point charges. It is rather not for proteins (that is regular Amber) but 
> for small (organic) ligand molecules.

I stand corrected. I should point out that David really does this for a living. 
In comparison, I just pretend. :-)

So David, I guess I'd go with GAFF first, MMFF94 fall-back, UFF second 
fall-back. By its nature, UFF should work for essentially any chemistry.

As for speed, both Tim and I spent time going through the Open Babel 
implementations of MMFF94 and UFF to minimize sqrt(), etc. IIRC, this was good 
for 10-20% improvement. I don't think anyone has really looked at the GAFF 
implementation.

Thanks for the suggestions David!
-Geoff
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