Phil's right on all accounts.
The Trappist and La Trappe have an awesome selection of belgian/belgian style ale, but both bars are on the small side. The Trappist is practically the size of a closet. My vavorite is La Trappe. It's got a cozy, plush, tavern feel, and it never get unreasonably loud. Great environment to enjoy some good brews.
The Monk's Kettle has a great selection of beer, but what drives me away is also the unaccomodating size of this pub/restaurant AND the fact that the same beers at La Trappe and The Trappist cost several dollars less. This place is INCREDIBLY PRICEY.
The Toronado is simply a great place. Tons of beer, a fun rowdy environment. However, this place of the four Phil mentioned has the smallest selection of belgian ale...but the prices are the best, especially during happy hour!