I found a factory refurb with 1 yr warranty 320A for $700, so pretty much cured my want of the extra goodies. Also, most of my flying is vfr, so I don't have to switch codes very often.
Another thing is the tray for a 320A and 327 is exactly the same, so I will go ahead and wire it for a 327 and tie wrap the unused wire. Then later if I want to get a 327 it is simple plug and play.
Get what you want, though, don't want to have those "I wish I had" feelings when your done.