I've had 205/55/15s on once. Specifically the Falken Ziex 512s. Tires were awesome in the summer. Because of bad alignment, the tires only lasted about 25,000. Supposively these tires are "all season". Tires were decent in winter, probably about 2.5/5 in winter. I'm currently on the 195/60/15 512s H-Rated. Tires burn pretty darn fast when you don't have your car done for an alignment. But, being on an H Rated tire, it went out pretty quickly and I'm pretty much due for new tires once spring comes in. I believe our cars are supposed to have T-Rated tires but please correct me if I'm wrong.
There are many factors that play in if you want a longer lasting tire; speed, tire pressure, weight, etc etc etc. But, if I had a choice of all season tires, it'd be investing into the Michelins for the high end.
For my personal usage
Summer = BFG G-force
Winter = All seasons because GVR4 in winter is just pure pwnage
EDIT:
Personally, stick with the 195-60-15 tires. To me, the car feels where it should be. With the 205-55-15 tires, the sidewalls are a bit smaller compared to the 60 series so if you hit a small pot hole, you'll feel a slightly harsher bump compared with the 60 series, but this is me, it will vary.