It may be just me, or the pack I had, but I really disliked the Summit Octoberfest I tried. I've always liked the Sam Adams, though.
I'm not sure what to think of Summit. It seems like every time I try it it's different. I've had some really bad pale ale, but I had some last weekend and loved it. I've always been impressed with their Winter Ale, though.
I'm a fan of most brown ales. If you're in the Twin Cities, or possibly Kansas City, and like brown ales you should check out McCoy's. It's a brew pub that has a brown ale that I really like. It's also only $5.50 for a 23oz (less at happy hour). They have good food, too.
When I'm out somewhere that doesn't have their own beers I'll normally go for something unfiltered like Boulevard, Blue Moon, or perhaps Leinie's Honeyweiss in a pinch. I'm also a huge fan of hard cider. Strongbow and Woodpecker are my favorites.