Yep that's a good buy as long as it's in great condition.
Just check that all is well and go for it
$800 equates to approx £550 here in the U.K. and 2nd hand "good" condition JS1000's usually go for £700 - £850 here (i think, it's been a while since I investigated)
Cheers
Steve
(Edited by ripl3y at 12:12 pm on Feb. 19, 2001)