I have the Pela Pro 14 (14L capacity), have had it for nearly 3 years, and it works great. I have not had the first problem with it but it is a bit more expensive than the others. It was bought more for convenience than price.....and, it's a breeze to take and empty at the recycle tank.

I got it here:

http://www.jerrybleach.com/pelapumps.html