Werner, hmm id go with the DB01, its a really good car and from the box its pretty good, the ZX5, getting on a bit in RC timelines i reckon, but not dismissing it, another good chassis.
Id give the XXX4 a miss though, its an overblown touring car to be really honest, from what i read, the XX4 nails it, and the XX4 is way old, goes to show, Losi put a hell of a lot of work into that car!
Jimmy would be the guy to really answer though, he knows the shizzle on most Buggies around
lee