Recommendations for PS2 USB controller converters?

I need to get a new one before Live comes out for PC. I used to have one that I bought off of eBay more than a year ago called "SuperBox 4" or something and it worked just fine on my computers, but we got a new computer over the summer and it seems to have compatability issues. For some reason, it will stop recognizing the controller in the middle of the game, so I figure I would just buy a new one. What are some good ones that you guy's have that I can get, preferrably off of eBay.

i got one from radioshack and it works great! supports the rumble and everything never and problems!