I use Carbonite, but you've already tried that
I was using Auctioneer, but it made my screen stutter and it kept dropping my FPS to 1, so it had to go (due to bad programming, not because of my comp.. (2x2GB) G-Skill DDR2 1066 MHz @ 5-5-5-15, Core2 Duo E8400 @ 3GHz, and Saphire Radeon 1GB GDDR5 4870). I am now using
AuctionMaster and haven't looked back since. Far far better on resources, and it's not listed on the official tech support forums for being a trouble addon (Auctioneer is).