There are a lot of options out there for you. i would say you need to consider what is mot important to you. Reliability I believe is the tops, and you will get a mixed bag of opinions on the XXX-4.
Consider the conditions you run on when making your decision. The XXX-4 is at its element on smooth tracks. Can it be made to work on a bumpy one, probably, but not as easily as some other cars and probably not as good ast the XX-4.
If money is not an object, can't go wrong with a BJ4 WE. as you want stick packs however, I would say that the SB V2 Pro and ZX-5 would be great vehicles to look at.
They are cost effective, and parts can be had online for them fairly easily. With the Academy being carried at amainhobbies, stormer, and others.
The nice thing with the Academy is that its very durable. the SB V2 Pro is a big step up from the previous Academy 4wd buggies, even the SB V2 Sport since it has that more rigid (but still durable) material.
Ultimately though if you can, try some of the vehicles at your track and see what you think. Don't base your decision on just what we say as everyone will have there own biases.
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