Check with http://www.rivesaudio.com. They will be able to give lots of helpful advice.
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Your dimensions aren't terrible. You are going to get a bump at 86 Hz, that is the 2 and 3rd axial modes (because of the 3:2 ratio). Depending on your ceiling height you could have some other areas of concern, but you accurately predicted the first problem (we use 1130 ft/sec--but that's at 1 atmosphere pressure so these measurements are relative). There are things you can do to deal with the issue from passive acoustical systems that can be designed (depending on how far you want to go) or you can deal with the bass hump problem utilizing a device such as our PARC.
The other resource I would point you to would be our room simulator. It allows you to plug in your room dimensions and move the speakers and listener around and see what it does to the peaks and nulls in the bass frequencies.
Thanks for the responses so far. My ceiling is vaulted from 9' to 11' and so I don't see any problem there. I guess my main concern is that I'm looking at upgrading to some speakers that have significant bass and I don't want to end up too heavy on the bass. Also, I like clean bass, without any "boominess".
I also heard that the Rives solution was very effective at the show. I've already set my speaker position according the the Rives website. The sound has opened up and the imaging has really improved. I'll run the room simulator next. Good work Rives!!!!