what is a reliable and good thermostat for keeping temps up? any recomendations? i need to buy one, and since i'm going to be getting an animal plastics cage soon (yay!), i'm going all out and want to make sure everything is as perfect as can be. i'm also going to head over to wal-mart to pick up one of those acu-rite temp things i hear so much about...but i need a good thermostat. and then what else do i need to set it up properly?-i'm thinking of ordering the belly heat option in my cage. is there anything specific i need? all help is very much appreciated!