5 CD (limit) -- Guidelines for drawing w/garbage in BB?

[Matt Ruff]

A common five-card draw situation that I'm trying to get a handle on: 2-3 limpers, and I'm in the big blind with A-high or worse.

Any thoughts on what to draw to with these hands:

AT863 (no flush draw)
KJ572 (no flush draw)
KJT94 (no flush draw)
KhQhTs3h2h
T9762 (no flush draw)

I'm looking for general principles about what to draw for in addition to specific answers about these hands.