Two pieces of advice, which I've always thought need to be at the top of the list regarding airplane purchases:
1. Make sure you know what your 90% mission is, i.e., what you'll use the airplane for most of the time. Are you really going to go into the back country a lot, or are you really going to just go sight-seeing a lot, or are you really going to take long trips most of the time? Are you really going to fly alone most of the time, or with your wife or a buddy most of the time? Do you really need a back seat, or a large baggage area? Questions like that help develop your 90% mission.
2. After you've concluded what your 90 % mission really is, then fly several airplanes which fit that mission. Some just won't please you--others you'll fall in love with--and just because someone else loves or hates an airplane doesn't mean you will. And like someone suggested, take wife's advice, too. If she insists that she wants to sit beside you, that eliminates the Citabrias and Super Cubs and other tandem seating aircraft, for instance.
Finally, of course, recognize that purchase price is only the tip of the iceberg. Some airplanes are maintenance hogs, not because of the brand name, but just by chance. If so, you really want one that any IA and any A&P can fix, not one that parts are a pain to find.
Oh, BTW, don't forget that used airplanes and used parts go together, which really keeps the price of repair in check.
Good luck!
Cary