I have a 7550E and 5550E and love both, they work great but do have limits, I did spring for a Connect Systems CS7000 M17 Plus
Its a 7550e with their own firmware, it has everything a 7550e has and more, and it uses the same programming cable

$299 is a good deal and it does 500k contacts
I use my 5550e as a base and have it remoted to my office I really like the display and audio from that radio