4wd buggy

i have been looking at a lot of different rc cars since my rustler is about done. i kinda want to go something that i can run on a track. i was kinda looking into getting a 4wd buggy. so far here are my picks

-trf501x (down side to this buggy is its belts and not sealed )
-b44
-laser zk-5

those are the ones im looking at now.

i like the trf501 cause i have always liked tamiya and i love belt driven cars. (loved my tc5 and ta05). but this one is not sealed so rocks and stuff can get in it and ruin the belts.

as for the b44 we sell it at my work and we have parts. so i would be able to get a good price on it and parts.

the zx-5 i like casue i already have lipo batterys that would work great in it. but thats the only good thing i can see on this.

as for pricing the most expensive one is the trf501x. its like 470$ and the b44 and the zx-5 is about the same pricing at about 300$

what do you guys think i should go with.?