Do I need a subwoofer? Which brand and model?


I mainly listen to classical and jazz - mostly trumpets and violins, with the occasional piano, viola or bass guitar. A couple of my friends have been suggesting to me that my ensemble lacks bass and having a subwoofer will address it. My setup includes a 2 ch. NAD C365BEE integrated amp, Wharfdale EVO 50 loudspeakers (pair), and an Oppo BDP 105 Bluray player as a CD player. The setup is in the living room, with three walls, and the fourth side open to the dining room. The living room itself would have been 18' L X 12' W X 18' H = 3888 cu. ft, but the fact that it opens up to the dining room makes the entire space more like 40' L X 18' W X 12' = 8540 cu. ft. Would I benefit from a subwoofer and which one should I get? Budget $1000 or close to that.
shugho
I found this thread on good piano recordings somewhere and will give these a try.

http://www.audiocircle.com/index.php?topic=31982.0
I am also looking to change the connector between my Oppo blu ray player and the amp, to eliminate that from the question. It is a cheap connector. I will try the blu jeans place,. I spoke to an audio store near where I live. The guy is quirky but has been in business for a while. He suggested not using a blu ray player but rather going with a CD player. This may be worth trying if the Oppo is giving it a digital sound. I am also getting my Music Hall MMF 2.1 turntable fixed by him so I can compare the same recording from both aspects (assuming the recording exists on vinyl as well). This will tell me if the digital aspect of the setup is the issue.
I have a JL Audio F112 and believe it to be the best unit available regardless of cost
I am seriously considering tape at this point :) (partly joking) I found a recording studio mentioned in that link in my post earlier that will actually make them as custom orders - at $125 each! I wonder if the sound on tape would be better than on CD and what tape players are now available. Interestingly, my NAD player has tape inputs.
Thanks Verneal, for your suggestion. I have moved beyond the subwoofer at this point. I should probably start a new thread.