Sounds like you know what you want and it's been working for you. I myself prefer tubs with lids that stay on, so that I can pull them out and stack them up prior to cleaning. This may be just because my space is so small. Had the same question re: agselect. I guess you just have to price out what you need and see which is cheaper. You might want to check with local suppliers for things like tubing and the resevoir. Make sure you have firm comitments for your rats though. Nothing is worse than gearing up and getting stiffed.