Mods' are great, but any possitive will give a negative reaction. It is nice to have extra power, but then you will need to have extra strenth in the drive area. It is also nice to have big <img src="/forums/images/graemlins/butwiggle.gif" alt="" /> tires, but it will have the same effect, you'll end up needing larger sized drive parts.
The best thing is go and do some offroading of your preferance, and debate the vehicals situation. Like brown said. <img src="/forums/images/graemlins/kewl.gif" alt="" />