The 436 & 536 were just released for sale a few months ago and they both still have some bugs they need to work out.. At this time I would not buy either of these until they have all the problems ironed out. (This is my opinion). I came to this decision after reading some of the post about the radios and how upset people were getting.
The 396 & 996 have been around for some time and are pretty stable. It is pretty much all depending on what your needs are and what you can afford. Portables are more useful for the money, My 396 goes back and forth to work each day and I really enjoy it. Actually some people have no choice but to go Digital, at least we have a for now.
The new scanners that you use a computer to program don't have banks like your 125. However I don't like listening to everything at once so I created Groups aka Banks for Allegheny County ie: North, South, West and so on. This way I can lock them out as a Group/Bank and listen to a particular area. ICORRS ICORRS (Inter County Regional Radio System) Trunking System, Multiple, Pennsylvania - Scanner Frequencies
is a multi county dispatch that includes Westmoreland/Armstrong/Indiana/Fayette and soon to be Somerset Counties you can Program all of these as one or Group them...
The scanner you choose, if it needs programmed I will try to help you if you like!!!!