Hey an RC VX - Cool!

I had a couple of Rock Crawlers James - they are great fun and modifying them can be as involved as the real thing!

I got loads of info at the UKRCRC forum - they were very helpful when I was starting out - http://www.ukrcrc.com/site/

The HPI one sounds good, but it looks like it goes a bit fast - and therefore not the best gearing/motor, but certainly a good start

Nick