One plus point if you stick with 72 mz is the availability of 72 mz TXs for next to nothing. An early computer radio will give you multiple model memory and most of the bells and whistles. Going down this route lets you use your existing rxs. However you may be the only person at a club field still 72 mz and the peg board is not in use.
6 ch 2.4 computer Txs are under 100$ and Rxs under 20$ from the likes of Hobby King.