Although I have yet to try any LIPO, the mini class might be a good choice for the future, as changing batttery weight at least won't upset the side to side balance of the car like a LIPO does in most touring sedans.
For those who have tried a LIPO in mini - how did it effect the front to rear balance of the car? Did you have to adjust your setup with LIPO over NiMH? My first impression would be that the car might be a bit light in the rear end with a LIPO, and as a result turn faster than expected/desired, or perhaps be loose in the rear.