I went through this. It was very hard. And very painful. I bought a 5 series BMW. While definitely a different car, the heavier more utilitarian look and feel - with true handling abilities - worked for me. It is a drive it like you hate it car too. And the one I bought was one of the last E60's made.

And, contrary to some comments, it is actually fairly easy to work on and maintain, in spite of being a far more advanced car. Gas mileage is also quite good, better than any Merc out there. It's also been reliable.

But.....you will NOT be able to go frugal on parts or maintenance. Yes, many parts are quite reasonable, and about the same as a Volvo of the same vintage - true! - but it is not a 240 package. You must care for it. Do not neglect it. It will cost you dearly. These cars do not forgive you like the beloved 240s did.

I have been happy with my swap. It's worked for me. I suggest keeping the 245 for the pet haulers, and find a well maintained used BMW for the rest of the time. I think it will work.