Just had a guest speaker at our camera club (Knox Photographic Society in Melbourne Australia)who repairs all sorts of cameras, when asked that question these were the points he made...

What you like in looks
What you want in features/have heard good things about.
The largest appature in that lot . (more coverage of the shot)

these are all very good points but the most important is what feels comfortable in your hand!

YOUhave to like what you wind up with!!

Hope it helps.
Jen