Gallo 3.1 Mains...What for the surrounds-Center

Recently purchased the 3.1's(get them tomorrow) and am now faced with a decision for the surrounds. We have been using our mains in phantom for center duty and have not missed having a center speaker. How would the 3.1's handle this duty? Working with a limited budget and the reference center is out of range at this time. Thinking about the Due or A'diva ti as a center, if it will really add to the experience, and a pair of either a'divas ti's or micro ti's for rears. Would appreciate opinions.
Thanks
Steve