Hairless if you get one are very interesting. I have my first 2 here now. The local HS asked me to take in those old gals, because only the wrong sort want to adopt hairless (double rex most likely). The ones who are like "Cool, those are neat!" But don't realize they need a bit of extra care than a furred rat. You have to be prepared to bed them down on soft things like fleece...I don't even like carefresh as it can get in their eyes since they don't have the same protection around their eyes. Hairless/double rex rats are prone to skin conditions, cysts, eye problems, heart and kidney problems in the genetic hairless rats (most pet rats are double rex). They eat more having such high metabolisms, often die younger, and you must be okay to see a LOT of scratches on them...hehe.
I love my old pink aliens, but I have been fighting a scratched eye that burst Bella's eyeball for months now, and I finally am thinking I won't lose her. :roll:
Get a double rex/hairless if you really research it, not just because they are different and/or cute.