For just bashing around, go with a Mini LST. Parts are available readily, and Losi's customer support is top notch.
The RC18B with a nice brushed motor (fantom mini mod or Reedy Minimax) is all it takes to have a very competitive racer. Brushless is overkill for the most part, although lots of fun!
I like the Half8 Kyoshos, but they need $50 in upgrades before you consider racing them (hubs/knuckles/motormount) and local parts support is low at most shops.
I've had a few of the mini's to date, Mini-T, FT RC18T, Xray M18T, Mini LST. I still own the Mini LST
Easiest to work on, by far the most durable, and it could be competitive with the right setup. While all the really little trucks get bounced around the rough parts of the track, the MLST blows right by them.