I agree with Pace the 1999 Seneca is the one to go for over the Baron unless you want to spend much more for a little better.
There was a IV for sale in Holland (grey with red strip) a few months ago, I met the owner in Romania 2 years ago, but I have no idea if it s still available,
there were not many IV's made, so they are a rare find, essentialy a III with V looks, some wil say the II/IV flies slightly faster than the V