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
Good advice Zd. Can you explain what you mean by a reference system? Do you mean an equipment setup put together by a dealer, for example, that is able to reproduce the sound the way I like it? I can try a local dealer that is willing to do that. I also need to find a piano recording that can be used in such a reference system, or even my own. By doing so, I would eliminate the effect of a poor recording. If you know of one, please let me know. I thought of contacting hdtracks.com to see if they will even respond to this question.
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.