[pbonsalb]

150k mile E93 M3 with a bad engine is not worth much. The E93 are less desirable since they have lower performance due to the added weight and less stiff chassis. I’d guess around $5k. It will cost the OP probably $12-15k to install a good used motor with fresh gaskets and rod bearings since he can’t DIY. Once he does that, he has a car that is probably worth $20k. Does it make sense to go through the hassle? Maybe just sell it to a DIYer.

Don’t know what to recommend for a replacement. Something newer, cheaper to repair, maybe with a warranty. I really enjoyed my E90 M3, kept it 10 years, DIYed tons of preventative maintenance including rod bearings, but it was time for a newer, higher performing, larger and more comfortable car. I bought another BMW that would be expensive to maintain out of warranty, but think the OP should either get one with a lot of warranty remaining or an aftermarket extended warranty, or buy a Lexus.