Butler Creek hot lips 25 rounders seem to work OK for quite awhile. They are not that pricey, like $20.
The BC Steel Lips ones are the hot ticket, and there are others (alum bodies, can be taken apart, etc).
I have a 50 rounder that is worthless if you put more than 40 rounds in it. i think its a ramline, but i dont remember. it aint wurf a crap really though.
i think the drum mags are more reliable, but other than the reg 10 rounders, the butler creek ones are the way to go. it's tough to find the steel lips ones locally though. bass pro has always been sold out.
25 rounds of 22 goes very fast, but is very cheap and lots of fun. also its worth it to shell out for the mag loader, handling all that 22 takes forever mag after mag after mag