You should make sure you really, really want a pair of rats before you buy them. In your case, enough to spend a hundred or so dollars on a really nice, space-hogging cage that you'll have to clean at least once every week. Then you have to let the rats have playtime outside the cage, and you also have to play with them and get to know them. Otherwise, they become shy and skittish and not very friendly at all. I'd hate to think I was responsible for encouraging someone to get some rats when they're just going to neglect them.