The only time I've seen a smacker was at a Cobra event in Cardiff...when it's electrics went up in smoke!!! Was a while ago, and not a 'master' smacker...from memory it didn't really compete with the other cars that day and looked to me to be more of a toy/bashing car than a racing car.
What's the budget? If you don't mind us asking?
And how much racing do you want to do?
The answers to those questions will really help us to help you