Premiere is my favorite of the Chimays. Rochefort and St. Bernardus are great in all of their forms as well. I prefer La fin du monde over Maudite, of the Unibroue beers, and their Ephemere (sp) is good once in a while (if you like green apple). Too many beers, too little time!
I have finally moved to an area that could Chimay! I will try it one of these days... I do love me some Westmalle Dubbels and Triples. St Bernadus Triple and abt 12 are great too. Troubadore, Pyraat and Guldan Draak are some other great favorites when I'm not craving a hop bomb.
Trader Joe's Vintage Ale is a Unibroue product. The 2012 is a particularly good one, I think. Pricing is great for Unibroue (Think it's $4.99 for a bomber bottle).
I like the Chimay Premiere/Red a whole bunch, too -- though I "get" why some like the Blue more. IIRC it's smoother but has more alcohol... which means it requires a bit of extra care!