Feeling the Need For Speed

Hello:

I currently own a 68 cherokee 180. Had it for 8 years. I'm IFR rated with 
over 600 hours.

I'm looking for a faster ride for me, the Mrs. and a small dog. I'm not
too 
interested in a turbo to fly high as the wife and dog are opposed to
flying 
on O2 (I know that will put a limit on the speed, but thems the breaks!).

I have been looking at Mooney (M20J).

Any pros, cons, alternate suggestions?

Thanks in advance

Mike