Yes, I would like to keep it and have both. I would really hate to sell my 300SD. It is kind of unique, I guess. I have seen pics of everybody's cars here on this forum. Not taking away anything from anyone else, but the car I happened to stumble on is just one of the nicer ones here. Nice in terms of condition but nicer in terms of maintenance records. I would hate to see it go. My son was born last June and I brought him home from the hospital in that car. As we were driving home my wife and I both agreed that it would be his car someday. Somehting you feel totally safe in.
As far as the 560 SEL, I looked at a few of those before I got my 300SD. I love the forever classic body style but wanted a little more longevity than performance. I just like the V8 package in the small sedan. I have not had the chance to drive a 400 but I drove my cousin's 300. It had decent power but I would like the same car with 275HP over 180HP.

I will keep dreaming for now.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R