crawlers, well i know a bit about them.
for fun, you can't beat the Tamiya txt. it's a kit, so you have to build it yourself, but they aren't too hard.
for the same amount of fun on a smaller scale, the TLT rock buster is good. or if you are looking for scale offroad, you can't beat an XC chassis (another one in my collection, mine's converted to rock crawl with a homemade 10kg electric winch)
i'm a member of Tamiyaclub, but i'm on my psp so i can't post links. google and look for me (same name)
Matt