Yeah man. I like discussing my favorite brews with fellow beer aficionados.
I'm on a bit of an Alberta Big Rock bender at the moment (not sure if they count as a microbrewery anymore, they're fairly big). The 15-can mix pack is a bit pricey, but every beer (you get five varieties) except the Light Lime, is absolutely delicious. I swear that Honey Brown is the best I've ever had, though it is a bit sweet if you're not into that.
Another local fav is Beau's Organic, but as far as I know, you can only really get it in the Ottawa/Montreal area. From what I've read, they've made their way to Toronto as well (not sure where you are). The pricing is decent, at four 600ml bottles for about fifteen bucks and their Lug Tread beer is a rather crisp lagered ale, which is kind of unique. The unfortunate part is, they've become popular so they are easier to find in the local bars then in the Lick-bo, as shipments sell out quickly. They have a couple seasonals that they mess around with each year, but I've never tried them. Probably my current favorite.
Another one to look out for is Granville Island, from BC, though I'm not sure if they've made their way out to Ontario yet. I tried a few varieties from another mix pack when I was out there this summer, and I was impressed. I found that the Granville Island Lager was especially good.
For Toronto beers, if you haven't already, check out Steam Whistle, which is a bit iconic now and is a punchy pilsner and Mill Street Original Organic, also a pilsner. Both good choices, the Mill Street being especially smooth and tasty, even though it has a tendency to leave a bit of a bad aftertaste. Mill Street has other brands too, but I've only had the Tankhouse Ale once or twice. Last I heard, they had opened up a brewpub too.
If you have any suggestions, toss them my way.