Need your opinion on 98 M3

[Philly X5]

So I have a second car 2002 BMW 525i Sport & Premium package with 109k miles for sale right now on eBay - immaculate condition/everything perfect.
Today this guy contacted me and offered his 98 M3 as a trade. From the pictures it looks like awsome car with 124k He told me he has is for sale at $10700 which I thisnk is toooo much. I also asked for the service records.

I want to get around 9500 for my 525i.

What do you think - I'd like to trade but not sure how much cash to ask from him??? What would you do?

Here is a link to his car:

Pictures by GaryE30 - Photobucket