Hi Worldtrialchamp,
I upgraded with the complete kit. For $200(AUS) the base kit with all those trials specific extras is good value, particularly given you just can't get it anywhere else. I had priced other carbies namely the Keihin (which has identical specifications) and it was $325 and needed $100 of further Keihin parts before one could even consider installing it onto a Rev3 (jets, special guide). Add to that a throttle cable, clamps, jets, the fact that the idle and mixture screws would be on the wrong side and you start to see the value of the complete kit that includes everything to match a 2008 model. Its easy to overlook the fact that you are not just paying for parts, but also the time someone has invested to make sure this thing works and fits well. I am not particulary technically savvy - yet it was reasonably easy for me to fit and when I had an issue (my fault) they guy was able to help.
I guess it depends on whether you are happy to spend many hours & effort trying to make something work or just want to buy something allready sorted with all the bits you need and all the hard work done.
Hope this helps
DW