When to replace a crank?

[ZenSojourner]

I'm buying this:



And the guy at my LBS wants to replace EVERYTHING on it.

I just want to replace the rear cassette and the chain. And the seat. And the pedals. And the tires. And the bartape.

The components were all new in 1998 (crank, rear cassette, both derailleurs, STI shifters), the frame is from 1987 or 1988 (it's a Terry Despatch, lugged steel). Left shifter replaced in 2004. It has a Sun wheel on there. Actually what I'll probably do is buy a new wheel with a new cassette on it and use that one permanently mounted on a trainer (depending on the trainer, if that's appropriate)

The guy at the LBS is a gonzo mountain biker who replaces all his components every year. I just don't think that's appropriate in my case.

Owner says it shows "some wear" but it has less than 2k miles (on the chainrings)

I actually don't know if the bottom bracket was replaced when the crank was replaced. If not, after 20 years I'm sure it needs to be replaced by now.

$225 is the asking price. I don't see many used Terry's in my size.