First, just how big are you?
Are you going to be able to take someone else with you without having
to take your wallet out of your back pocket to have enough room?

I'm 5'10" and 170lb. (I *am* the FAA standard pilot.) The occupant of
the passanger seat is 130lb.

Second, are you planning on using the airplane for travel?

Yes.

Depending on your age, the short legs due to fuel supply won't be a
problem. If you have a strong bladder, and want to take someone with
you, you won't be taking much luggage with you. Two people and camping
gear to Oshkosh? I don't know!!!

Short legs?? I can fly with my pax and light baggage with full fuel and
be under gross (well, very close, or a bit over, but certainly safe)!

With some real baggage I can still get 2 hour legs with reserve which I
could live with. I'm cursed with a weak bladder anyway.

You already have your certificate, you don't need a trainer.
Look for a four seater, more options, better resale.

Definitely leaning that way now.