What subwoofer to choose for 2 ch and HT combined

Since you have a pretty top-notch 2ch set-up I would not compromise it any more than I had to. A pair of subs with a high degree of adjustability running off of the speaker taps would be the best way. This way you would be completely out of the signal path and could switch the subs off if you desired. This would mean sending full range torturous bass from movie soundtracks to your main speakers. If they dont distort without the subs durring movies I wouldnt worry about damaging the speakers.

I like the Martin Logan Depth personally. Room size and sub placement will dictate what works best for you though. You will want a sub whos lowpass slope compliments the LF rolloff of your Meadowlarks. The Vandersteen 2Wq/2W is worth looking at too.

Good luck!

need more info on the room and setup....

Aerial sw 12

I myself would recommend a UFW 12 sub with R-DES digital equalization from AV123.com. They have a fast, and musical bass response, and the controls on the back of these units allow for a high degree of flexibility. The R-DES is basically a room correction system for your sub, allowing you to really flatten the fr of the sub in your room.

Link: http://www.av123.com/products_product.php?section=subwoofers&product=8.1

I would also invest in a decent set of sub cables that are able to deliver fast, solid bass.