[TowerTalk] Old "new" Prosistel 61 - need comparison with current model 61D

[W7ZZ]

A local ham with a health issue is selling a new, never used Prosistel 61 that he bought in 2001 but never installed.  It's a 48 volt AC model.  It has the Prosistel control box, which I think is the C model.  I would like any information that can be provided on the differences between the old model that would have been sold in 2001 and the current version, which I know runs on DC (but I don't know what difference that really makes).  My debate is price for this new/old unit versus biting the bullet for the brand new one with a warranty.  I'll be turning a 4 element Steppir at 70 feet and a Cushcraft XM240 at 80 feet in a location that several times a year sees some high winds.

Any comments will be welcome.  Any opinions on what a fair price for this "new" unit would be?  Thanks in advance.
Doug 
W7ZZ