If you eat at Bluepointe you can go across the street to The Tavern @ Phipps Plaza (same place where Twist is located) Known for its talented bartenders and barmaids w/ microminis.
Any particular reason you are limited to Buckhead. Ecco in Midtown is also a great spot for food/bar.
Bluepointe definitely has an... active... bar scene! Twist is active too but not as good food.
It's not in Buckhead, but Two Urban Licks and Rathbuns both are pretty trendy these days. Also check out Trois in midtown, it's walking distance of a lot of other restaurants/bars/etc.