Which one do you think is the best?

I'm looking to bid on an eBay auction, but won't be available at time of auction's close - so I'll need to utilize one of these services...

I don't mean to be pushy here, but I leave in 30 minutes - and need help before then!

http://winsnipe.com/ is used quite a bit, although I have never used it.

Thanks for the link, but this isn't going to be a regular thing.

So, I'm looking for a web-based free one.

I just won't be home for the end of an auction, that I REALLY want/need to have.

Auction Sentry is fantastic. I used it quite often and new users get to evaluate it for 30 days if I remember correctly.