I haven't followed the ads or scope prices for a long time. I want to sell my Santel 180/1800 Mak w. JMI Event Horizon; Intes-Alter Mk84 astrograph w/Losmandy D & FT focuser; and Orion badged Intes MN61 w/FT focuser. Optics & mechanicals in excl to v.good condition. Any suggestions for fair market value on these? Prefer to sell all as a unit.