Helping a friend in looking for a BMW

Seen a few nice ones.. but for really daft prices for what they are, the usual price is between £3750 and £4250 but found one my friend really likes but the guy wants £5500 for it and isnt showing signs of shifting.. theres nothing special about it, nothing extra on it and the mileage is average so not even low. When i put it through an insurance quote comparethemarket came up vehicle estimated value £4100 so really unsure. The car he is after is a bmw 3 series, e46 coupe, 330ci model , M sport from either 2001 2002 or 2003 registration. This one in question is a 2002 model with 120k on clock.

Thanks