Tact 2.0S or Tact 2.2XP

Before spending a ton of money on signal processing, try room treatments, and understanding of what is happening in your room. Read Jim Smith's 'Better Sound' as a first step.

The 2.0S has been discontinued because newer, faster processors have become available, however for the price difference you will still get all the basic room correction, plus a bunch of nice features that it will take a while to appreciate. No amount of room treatment will accomplish as much, or let you try alternatives while you can still compare the results directly.
All that said, you must be wiling to be patient and learn over time, with a good bit of trial and error. Folks who think they can plug and play will be disappointed. I started with a 2.0, traded up to a 2.0S and then to the integrated 2150XDM. I am still trying out new settings and curves.

The 2.0S provides the same room correction as the 2.2x, but without the sub x-over feature (that you apparently don't want). The xp version adds the Dynamic room correction feature, that may or may not be worth the extra money to you, as well as the ability to make changes on-the-fly without a computer. I've owned the 2.0S and the 2.2x (with and without mods) and decided to spend my extra $$ on mods rather than the Dynamic room correction feature.
You won't get the Dynamic room correction feature in 2.0S. Whether you'll miss this is hard to say. If you want to be able to make and compare correction curves on the fly, go with the xp. If you want better sound and are willing to put up with less convenience, go with the 2.0S with a power supply mod, and possibly digital input and output mods. Or spend more and get it all.
I find room correction indispensable and unequalled, esp. in bass control, as I'm very sensitive to bass nodes. Room treatments can and do help, but IMO, won't replace what the Tact can do (I still use bass busters and absorption, and diffusion).
If you get the 2.2xp, you owe it to yourself to at least borrow a sub or two and hear what they can do in a Tacted room. My speakers are rated -3dB @ 20Hz and still adding Lyngdorf corner subs provides a huge benefit.