I have been doing the same! I may just keep the 300CD and just add an R107 to my stable! I just can't keep my eyes off any R107 that I come across! I remember when I was drunk... I saw a beautiful topless 560SL on the side of the road (in front of a 5-star hotel...)
I just sat there and admired it... people obviously stopped and wondered what I was lookin' at. I didn't say anything and many of them just said... "wow, what a nice car..." after they looked at it and I for a few seconds... hehehe
I do want the 560SL for its 5.6L V-8, however, I think I could live with anything else as long as I get the front spoiler a'la 560SL...
BTW, here's a page that might interest you.
http://fly.hiwaay.net/~gbf/107/rt.html