I haven't had any nitro vehicles to give first hand accounts of any performance.
You said about a park to run a vehicle at.. I'm assuming you want to go off-road with something like a truck/buggy?
Have you ever had a RC before?
150 GBP = $236 US dollars. If you plan on a Ready To Run vehicle, your choices are going to be slim with that amount you want to spend.
1/10th scale 1/8th scale?