Don't overlook the Lycoming powered Diamond DA42. Tried and true engine, and delightful performer. The diesel is fun, but the DA42 L360 is a rocket by comparison. Great single engine performance too. I was fortunate enough to fly one for 20 hours last year. Not quite the economy of the diesel, but with the power 'way back, probably better than most twins.
And, if you need, Diamond will sell you parts... Piper, not so much! (see earlier post) Careful with the R114 for repair parts too, Nice plane, but I've heard bad things about parts availability recently.
Another delightful plane is the Bellanca Viking. It's probaby the raciest of all types in this class, but again, repairs are becoming specialized work, and proper care and hangering is vital to sustain its life.
I love older planes, but some recent bad experiences with lack of repair parts for some types, has left me VERY glad I own a Cessna! Some aircraft sit grounded right now, hoping for parts to become available. Until they do, no flying! A client told me this morning that he just will not recommend an older Piper to his clients anymore, as he just does not want the responsibility of recommending an aircraft with poor factory support, and no other options.
Buyer beware!