I went through 2 inner tubes today, I've been using the bell tubes at walmart because they're cheap, but lately I've been going through tubes so quick the savings aren't really worth it. I hoping to find something like these at the LBS, but has anyone used anything similar with positive or negative results?

http://www.danscomp.com/446040.php?cat=PARTS
http://www.danscomp.com/446017.php?cat=PARTS
http://www.danscomp.com/446002.php?cat=PARTS

The super thick seem like the best bet, but I don't know if I trust the difference in diameter from the top to the bottom, it seems like it would inflate funny