I don't change the 2wd although I did try the Kyosho RB5 for a while. It's the 4wd's that I have a weakness for!! Over the last few years I have had 'several' Lazers, two D4's, a Pred and two B44's. I have also had an RC18 for a bit of fun and a couple of T4's.
Now that might sound alot but I bet there are a few people on here that will make that list look like nothing!