Filtration Question

What is a good filter to use with turtles, I purchased the 501 filter system and it works ok, but i was thinking about getting something more so it doesnt have to work AS hard!! I have two painted hatchlings in a 29 gallon, they are alittle bigger than a quarter!!

What would you guys suggest???

I had a 40gal, filtered with a fluval 4+ and it sucked. I jumped straight to the Fluval 404 canister. I now have it running in my 125gal and even after 4 years it's still doing a decent job. I haven't tried anything above that tho.