Dgaylin
Gongrats and happy shopping!
Note that KR's observation re: the SMS' auto-correct shortcomings suggest that you might want to seek out a unit that provides both superior auto-correct AND a read-out for manual tweaking. This way, you'll start tweaking from a (presumably) better starting point and save yourself some time/effort. One of the earlier posts here implied -I think - that Audyssey Pro does the trick.
Another advantage of "seeing the room" for me was observing the large "hump" in my room from app 75hz to app 125 hz. This caused a higher than optimal X-over point at the SMS' built in 80hz highpass point. A pair of Bass Busters proved a great (I do mean great) fix.
Thus I'd still go for manual + superior auto if I could. If you can't find such an animal, the SMS-1 is a great tool at a fair price. I get pretty amazing results in my room with any of the main speakers I've tried - Verity Parsifal Monitors, Sunfire Cinema Ribbon Monitors, Maggie SMGs, and Ohm 100s. As KR noted, though, The SMS' high pass x-over has limitations. If you do go with an SMS, Id suggest that you either use mains that are happy being crossed at 80hz, or mains that you run full range. Otherwise, you might need an external high pass.
Another idea to bear in mind. My Velo subs don't perform nearly as well as the similarly priced SVS subs (they're much smaller, though). There's some debate on the sub threads on A-Gon as to which spec is more telling for a sub: "group delay" or "distortion". I don't have the knowledge to take a side here, but I'd note the $600/per model from SVS does a very good job on both tests.
At the end of the day, if you're willing to do the work, I suspect that the SMS, a bass buster (or 2), good subs, and good main speakers can provide amazing returns on your loudspeaker investment. In my case, $600 (for 2 bass busters, $600 for an SMS-1, and $1200 (for 2 SPLR8 subs) provide great bass performance and virtually seamless integration with a variety of different main speakers (dipole planars, omnis, and traditional dynamic minimonitors among them). At $2400 plus mains of your choice, I suspect that this deal is hard to beat.
Marty