SVS or REVEL Subwoofer

 2 REL S510s should do the trick. Good luck!

Definitely 2 REL subs.  They are not really expensive relative to your other gear.  2 subs disappear and blend much more easily than one. I own two pairs of REL subs in my 2 channel systems, Carbon Specials and Carbon Limiteds.  Listeners  don't even know where they are.

I think many of the responders didn't fully read your query.  Your room is small and stuffing in two subs is going to be challenging.  I have two SVS SB4000 in my H/T room and they sound great for H/T but it's a much larger room.  The SVS subs are nice but they are down the performance chain from your main speakers.  Trying to get two subs for your $2K budget won't work.  You will be too far down the model lineups.  I would get the single best sub you can afford (now) and put bass traps in the necessary corners.  This will likely be the best bang for the buck and should sound very good in your small room.  If you're dissatisfied, you can always add a second sub later when funds permit.  I vote for a single REL T/9x and bass traps.  Good luck and cheers.

@rick_n 

Thank you for your excellent input.  Great observations.

I am going to my dealer tomorrow and looking at the following models:

Within my budget:

- REL T9x  $1,299

- REL HT/1510  $1,699 (leaning towards this one)

Above my budget:

- REL S/510  $2,749

- B&W DB2D. $2,700 (floor model)

The B&W appears to be the best of the bunch and offered at 40% off retail.

I'm concerned that the B&W and REL S/510 may be too over powering for my room, which is 12' wide and 14' long.  Bass traps are installed in all four corners of the room.

If you care to weigh in, please do.  My appointment is tomorrow at 1:00 pm.  Thanks to all!

I think that size room is going to be too small for two subs.  I agree, get one high quality sub.