Hello, I am Clement and I am the administrator of www.bricktrucktrial.com. I'm a new registered member on eurobricks.com and I still have to get to know the forum, its main lego themes and the people participating in it. I guess there is a "Present yourself" section and i'll soon post a topic there.
What I would like to say here is that bricktrucktrial.com is not dedicated only to Polish TrTr races. in 2 words, bricktrucktrial is a website that aims to regroup trTr builders on a common, english platform. Members present their trucks and can discuss about techniques, questions, challenge rules ... I'll present bricktrucktrial.com in another topic. In polish, i know trucktrial.pl wich seems to be their main website (google translates it well).
About your original question, I also think the cherry picker is a good set, with gears and motor, and wheels, and mechanism, and it is not so expensive. However, it is "studless" i.e. it contains mostly non studed parts, wich may disturb you if (like me), you prefer the "old style" studed parts. It is a relatively new set so you will not have any difficulty to find in MINT (new). On the contrary, older, studed sets may be more expensive and/or hard to find. It depends on what you can find on ebay for example.
I'd recommend to first, buy a decent technic set (or many) to get used to the technique and the mood. Then, use the parts of your set(s) to build your own MOCs. The more sets you have, the more parts you can use to build MOC. and of course you can still unconstruct your MOCs to rebuild the original sets. Finally, you can buy separate parts on bricklink to enrich your collection or if you need a certain part for a certain mechanism and don't want to buy another full set.