That's how often I get them--and I can't wait to swith to Marathon's, as you've recommended, when I change out my studs come late March/early April.

Regarding tools to change flats--I think if you've got a cell phone and a commute that keeps you close to a town, you could get by without. I think you could even call the LBS for a pick up. But, you should consider kevlar belted tires.

That said, it sure is nice having tools around for minor adjustments. I've changed several flats on the roads--it only takes about 10 minutes.