Huge first preference if new: Brunswick Gold Crown 6. Factory standard pockets (5"), not the tournament edition pockets (4.5").
Careful with a Diamond in Atlanta. Go to Mr Cues 2 they have two of them. Play on them, then go play on the GC's 6 feet away from them. The rails bounce completely different. I personally hate the way the Diamond's bounce.
Second choice if new I'd go Predator or the Mr Sung Rassons that are in Shaw's room.
If used, I'd get any Gold Crown ever made.
I wouldn't take a Diamond if it was given to me for free.