I think I'm to the point where I'd like to try a tank. I don't want to buy a high end one, since I may not like them. I'm thinking just a DCT which I've seen for around $10-$15, and I think I'd prefer one with stainless end caps over the Delrin. Any thoughts or suggestions? Also I've noticed they make those pre-punched cartos, with the little flange on the bottom. Do you have to use these flanged cartos, or can you use any carto and just punch it yourself? I've seen them single, double, and triple punched. Which is the best?