i am running the thunder tiger eb4 right now, and as long as you dont go out and smash it up to the point where you need replacement parts, youll be fine.
www.nationalrc.com carrys a good selection of eb4 parts. if you do get the eb4, make sure you get the S2 version. its much better than the S1 eb4. as for the crono, its also an awesome buggy. however, parts availability probably wont be that good either. just keep doing what you are doing, read up on the buggys, and ask around. it all comes down to you. if you ask me, i would say the eb4, because its what i have, and what i like.