Good sounding, small center speaker

Try using a "regular" bookshelf speaker for your center. I find they work better than most center speakers.

For those with larger centers; I found that setting the output to small speaker improved the clarity of larger center speakers in my HT system.

the gallos make superb center speakers as long as you have the speakers rolled off correctly with the bass managemet system. The a'diva system i had was one of the most musical systems i have owned. you wont be dissapointed.

I would recommend against a "mis-matched" center, as it will not work! You'll never have a believable, cohesive soundstage, with smooth tonal transitions, and a system that "disappears". Rather you'll always be aware of tonal shifts in the sound, and the fact you are listening to "speakers" and gear, not the soundstage!
I would also recommend against small single woofer/tweeter designs, in favor of dual mid/woof speakers, which will control acoustical reflections from floor to ceiling, and provide often better transient reinforcement, and dynamic impact, dialoge inteligibility, etc.
Alternatives I'd recommed are Polk RM7200 system (???...maybe it's 8000), Infinity TSS1100 system, and little
Atlantic tech or M&K Systems as such.
I used to sell the otherwise very clear and detailed (on axis, that is) Maggie system lacking dyanmics for movies, and not so strong, while off-axis listening is combfiltered for a rolled off sound.
hope this helps...