I think it's a fair price what he is asking for it
I've paid my manitou DH in 1996 with a manitou EFC dh fork arbout €2500 euro's
They are mutch rare than the usual FS version
the DH version had 2cm more suspension in the back with a differnt rocker than the FS and a higer BB height
and mutch mutch rare than an marin frs
Id you run this Manitou frame with headsetreducers tot 1 1/8" you will also reduce the chance of craking headset tube
mine DH is without cranking headset tube and I rode it a lot back into those day's
I ride it mostely for xc/trailriding sometime's a local dh race back in the pak