I bit the bullet and bought the maha (Powerex) c9000. Newegg occasionally have deals on these for $50 with a pack of 4 AA's thrown in and free shipping. Great device and it did bring some of my (previously thought to be dead) batteries back to life.
If I hadn't gotten the c9000 I might have picked up the LaCrosse BC- 9009 ($10 cheaper but recent spotty reviews turned me away), or the BC-700 ($30 on amazon, free shipping) if you are okay with the slightly lower 700ma max charge rate.