Hey Corky: I'm partial to going with Collins Microline when there is
space behind the panel. A tagged VHF 251 Com runs around 800$. Eastern
Avionics lists a special with a VHF 251 and a VIR 351 Nav for 1200$.
TDR 90 xponder for 900$. If there isn't space behind the panel , then
the ProLine series with remote heads. Plus, the ProLine remote boxes
have helped out a number of times with W&B problems.

I haven't played with anything other than Collins, King and ARC, so I
can't comment on any of the others.

Craig C.