Simon's idea is all very well if you are going to set the world alight overnight, but I'm sure most people would make very good use of an entry level TM for a couple of years and armed with that knowledge and the money you have made , then it might be time to get a monster.
The simpler the TM the more likely you can get it fixed quickly, maybe even locally and believe me that's a major plus if you don't live in Cornwall.
Prowler, Pheonix, Blazer would all do a very good job and they are simple with no 'extras' which add little value except to the price.