A couple of updates. I'm a little embarrassed about #1. because I never measured my room. It turns out my room is NOT a large room. It is barley a medium room. There is a lot of empty space and it makes it seem bigger than it is. I'm working on adding more sound absorbing material.
1. Room = 1600 cu ft.
2. I can spend a little more than $1000.00 now. I was able to convince my wife of the critical nature of such a purchase.

3. I'm considering purchasing 2 subs (1 for now. add the second later).
4. I'm considering adding 1, bigger, stronger sub and 2 mid-bass speakers.
My appointment to listen to the Martin Logan was canceled. That's okay because I decided to look at other options.
Some have strongly suggested 2 subs for music as they may blend better and offer better positioning options. This would actually be a good option as it would allow me to spread the cost out over several weeks.
I only had one person recommend the option of one powerful sub and two mid-bass speakers. This has some appeal. It may help blend and give more of that deeper mid-range I like. I don't know if this is even a viable option. I have not researched any mid-bass speakers yet because I want to get more advice on that option.
SVS Options:
2 x SB12-NSD = $1199.00
1 x SB13-Ultra = $1599.00 (a little more than I want to spend but...)
Power Audio Sound Options:
2 x XS 15 = $1498.00
1 x XS 30 = XS 30 = $1149.00
HSU Research Options:
2 x ULS-15 = $2049.00 (I would have to wait a couple of months to add the second)
1 x VTF-15H = $879.00 (Great value but I'm not sure this is the best sub for my music)