Old Rasputin is great, I can get that pretty much anywhere in the country. But the best ones are the ones you can only get in your respective neck of the woods. This brewery in Seattle called Holy Mountain put out a milk stout for a couple weeks called Shadowlifter. Man, that one was goooood. Perfect balance of coffee, cocoa, and mild sweetness while still being smoky.
Total Wine has a pretty good selection of beer brewed in FL. I try some occasionally, but none of it ever really wows me. I haven't been able to get some of my favorites in a while as they've stopped carrying it.
Ballast Point makes a porter called Victory at Sea that was one of the best beers I've tried, but I haven't seen it in a long time.
A few years ago my usual was Kellerweis by Sierra Nevada, a really good wheat beer. I'd get a couple 6 packs of that one every time I went to get beer. They quit carrying it a few years ago though and I haven't been able to find it anywhere. I've tried searching for a wheat beer replacement, but everything comes up short. Some Weihenstephan's are pretty close though.
I really like the undead party crasher for the size of the can. It's a bigger can that I usually sip on for a couple hours, but it's like the perfect amount of alcohol over that period of time for me...gets me buzzed right where I want to be.