There is nothing wrong with paying more than one has to for any product. We just don't want you to.
While NHT sells and services NEC, Samsung, Nortel (only service), Grandstream, and Ubiquiti phone systems, we lean toward offering our customers Asterisk based systems. We use Asterisk in our office, and so do the two Internet service providers that are based here in Kalispell. They and I know the difference, and so we chose to save our money on the best.
Asterisk is open source (free) software that is full-featured and functions as good as, if not better than any popular name brand phone system software. Please ask me for referrals to my customers who use Asterisk based systems and they will tell you so.