I don't know about the caddy, is that one of the multiply displacement engines? if so, run as far away as possible.

Old Jaguars are good cars, just nobody wants to pay to maintain them, and those that do, don't sell them, as least not cheaply.

MB's are nice cars, I don't know of any manual trannies except for some 70's models. which you don't want, some have 0-60 times around 18+ secs.

Pre 1990 SAABs are nice if you like weird. Trust me on the weird thing, they are.