Just bought a plane eh?
My advice - start saving and don't believe anything the salesman told you!
Dont skimp on avionics - they might just get you out the pooh one day. (ok ok so an intercom is a "luxury" and can be done cheaply :-))
I just spent £22+k on new avionics for my PA28 I bought in October 2014. Full digital IFR kit, new AI, new Intercom, new Audio box, New Garmin 430W new Garman flip-flop com/nav, new digital transponder, new DME, repositioned ADF, new headphone jacks in all 4 places etc etc etc... Avionics almost worth more than the plane now!
Bournemouth Avionics has my vote for anything you need Com replacement related. Brian did a great job.
Now I'm all 8.33khz compat, I can trust my instruments (instead of the failing old ones) and just need a second Altimeter (later in the year) and then fully airways compatible
Ownership is great, but sure is not cheap