clk quality on the earliest model was dodgy... i wouldnt touch it with a barge poll with such high mileage.. pay a lil more for a low mileage (say 40-60k) and the trim bits should hold tight for a few more years.
My SLK is a 1998 model, and now has 103k miles and the quality of the car inside is terrible.. looks like a bomb went of on it.. The only upside is the car otherwise holds the road very well and is so heavy for the engines, that is just feels like a rock, though it isnt. In terms of your CLK, id say hold back, or email me some details of what you are looking for and i can advise..
Im not a dealer, just an enthusiast, and have family friends with various CLK models, and all have complaints, so generally i think i know a bit of what to look for and what not etc..