Here's what I use:
If you're looking for a display cage: http://www.reptilebasics.com/2x3-Cag...h-p-16286.html
If you're looking for a rack system:
http://www.reptilebasics.com/Reptile...p-1-c-251.html
I use these because I don't have a dedicated snake room (yet) and so my room temps dip at night. I like these cages because they are very well made, have the heating installed, and are shipped in one piece. I like the racks because the tubs are enclosed on three sides and so it's easier to maintain constant temps. As with the cages, the racks come complete with belly heat, and the tubs and shipping is included.
Rich also sells Helix t-stats, and temp guns; both important items for use with a rack system. I have a few of the 'sweater box' sized rack units and a few cages also. I will also purchase a couple of 70's for the larger females as well as a shoebox rack for hatchlings next winter.
I hope this is helpful for you!