Well, hillstream loaches are a good choice, they can tolerate wide range of temperatures, Gastromyzon, that is...
But my advice with them is that put them last cuz they feed mostly on algea and sometimes they don't want to eat anything else, so this is the main reason why they are not sutable for new aquariums...
If you look at river tank, you will se a good setup of powerheads, maybe this will help...
also you have a good step by step setup on
http://www.loaches.com!
what about some other small loricariids!?
Something like hypancistrus?!
regards