300 SDL or 2005 E320 CDI?

[Peter4]

I have a choice between an 86 300 SDL with 150,000 miles on it, great interior except cracks near speaker grills, new rotors and master cylinder put in although it's yet to be determined if the generic mechanic used OEM parts. The exterior is nearly flawless. I have a trusted mobile mechanic who will go to the different city where the car is, and although he won't be able to do a compression test, he'll be able to take the wheels off, and do a test drive.

The other car, the 2005 E320 CDI has 186,000 miles on it, possibly no records, but the seller seems a decent person. He picked the car and two other Mercedes up in Las Vegas.

I'd be interested in what anybody thinks, and I'm wondering if anybody agrees with a consumer review that the passenger seat in the 320 CDI is uncomfortable.

My last 300 SDL was totaled when my girlfriend was hit by a crazy hit-and-run driver, and the strength of the car prevented her from having a headache after the event. I need to buy something soon.

Thanks

By the way, has anybody used Sugru for dashboard cracks? It's a novel substance, and I watched a Lexus owner successfully patch his cracked dashboard. It's strong, and has real tolerance for temperature changes.