Got another local plane to look at Friday morning. A 1974 150L, N11742. The owner says the radios are shot. I realize that the sky is the limit when talking about avionics but what would a decent, safe basic system run and what does a basic system involve? $500, $1,000, 1,500? He says the transponder, ELT(whatever that is ) and the VOR are OK. Don't need a lot of detail here guys, just something in the ballpark I can do some rough figuring with.