well if four grand is pocket money for you, go and buy it, what the problem.
if its the bike you want, and you think its a good deal then go do it. its what you want that matters. i,ve spent 100,s of pounds on my MC16 putting on 21 forks, 18 swinging arm etc. a lot of people ( dave ett) think i,m mad, but its what i wanted to do.
its your choice mate, either go down this weekend and buy it. or forget about it and wait for another one to come along. but will that one be any better.
as i said before go and look at it and ride it. if you still want it BUY IT. if it goes tits up you can say i told you to do it