You may have that one dream car you want to drive, but its more fun to compare it to something else. You'll be surprised how cheap it is to add another car.
There is no difference to the experience you get on a weekday. If you can't get a day off work though it's only £10 more.
A blast package will give you a nice 3 mile taster of each car. Double up to 6 miles per car to really get to grips with it.
Finish your experience with a pro-driven high speed passenger ride then collect a photo print of you in one of the cars.