A 172 is a great plane, but some models are better than others.
I would get one with a low time Lycoming without the AD designation.
Don't get too caught-up in the radio package, that area is changing rapidly. Something new today will be obsolete in a few years.
Your personel use will dictate what you should buy. If you plan taking long trips, a 172 will be a 2 place airplane, can't fill the seats and the fuel tanks. With the 180hp conversion you get a gross weight increase that would allow four adults with nearly full tanks, but more$, and reduced range.
BTW I own a 182P, great plane. Fill the tanks, fill the seats and not worry about range. When flying alone throttle back to 60% power, lean to peak egt and get 120kts at 10gph. Thats close to 172 speed and burn with alot of power left when you want it.
Good luck in your seach.
