Received my VX-537 UHF 450-520MHz, 5w/2w/1w/0.25w --- just switched from my MTS2000 UHF a4.
Radio you guys should look at:
Stuff that the Vertex does that my /\/\ doesn't ---
- frequency bandsplit goes way down into the 440's i've been transmitting at 4.9 watts on 440.000Mhz...
- If you are looking for a frequency display, it will accept a numeric display for the alias, it will also allow you to utilize the "." such as 445.6250, the display has a "." between char 3&4
- Up To 20 zones (not 16 as vertex advertises) with up to 512 channels.
- can scan all 512 channels at once with group scan
- same profile if not slightly smaller than the MTS2000
overall solid radio that needs only one improvement <--- a VHF version...
And you can also add the cimmeron MDC1200 board. The radio will encode and decode with alias's. 
This one you need to open up the radio. I have not installed mine as of yet. Got one in my vx900 and 920. work great.