CB!
It has been a while. Good to see you pop back in for a visit.
I've been super happy with my BMR as a Center. lay it on its side with the Tweeter rotated 90º and it far outperforms many others.
As for changing things up, it's always fun to play with things. There is just precious little that can compete with what Dennis does. A lot of folk over at ASR talk up the KEF R series for Speakers worth their salt. Even though I'm personally not as much a fan of them, I do know they sound good.
Dennis will also be releasing an HT Tower soon, featuring Purifi Woofers and a Mundorf AMT in between a new version of the famous BMR Driver (for an MTM config above the woofers). This new design is promising higher Sensitivity and should be low-Distortion and hopefully low-compression. Only downside is that they will tip the scale just under Five-Large.
Other than that, I would urge you to check out the JBLs. New Studio 6 line-up seems to be available now, including a 3-way Tower, the 698. Too early for reviews yet, but hopefully these will bring a lot to the table. Many also seem to like the HDI series, though they are more expensive and not completely without flaws.
If you can wait on the Center for a little, I would urge you to do so . Wait until you decide on a full upgrade path, then pull a whole new Front 3.
In terms of Centers, I agree with Doc... Avoid the MTM centers and look for good 3-way WTMW designs.
Cheers Amigo! Don't be a stranger!