RE: Cheap 2.4 System
The RDS 8000 would be a great radio for you to get started with. Yes, it can be buddy boxed. I had a RDS 8000 since they first came out and it's a rock solid radio that will serve you well. The only reason I don't have it any more is because I gave it to a buddy after I got the new Airtronics SD-10G.
Ken