Tadiran dealer should be in later today. All-in-all I will have compared (in no particular order):

NEC Aspire
Avaya IPOffice
Avaya Merlin Magix
Zultys MX250
Tadiran ???

I have emailed Telrad and Comdial and am waiting for responses.

There's also a chance that I might take my Legend Release 4.1's and upgrade to the last Legend Release (7.something) and add some DS1 cards to improve the networking. This could buy me 3-5 years for VoIP to mature and could be dramatically less expensive than a new solution. We'll definitely have to dig deeper into maintenance costs and hardware availability/reliability if we go this route. This approach is popular with some and extremely distasteful to others in our executive group. It'll end up being a cost-over-time vs. benefit analysis.