I have seen used electra centers for 1000...they have Be tweet but no idea if it would work well. I would save for matching center. also, it depends on you...I dont critically listen to tv's/movies and I have mixed matched centers with mains many, many times. it doesnt bother me...I have used my focal cc with maggie lrs...lol.
Power: Marantz sr7008, NAD C 275Bee x 2, Video: Oppo 103, Samsung 75un6300 LG oled c9 77
Speakers: Focal aria 948, Focal cc900, Klipsch synergy KSF 10.5, Magnepan LRS, Audioengine A2+
Subs: Rythmik FV25HP, Rythmik FV15HP, Velodyne HGS 12, Velodyne VA1512