No problem, I was just addressing the advice to buy a whole front stage. While that would be nice, we don't know if it is even an option for the OP. A potential $400 purchase became over $1000 pretty fast. Given the choice of doing nothing, or getting the center, I would get the center. If he can afford a whole new front stage then awesome, get to shopping!
I have had to make due with mismatched speakers before, and while a bit bothersome, it is nowhere near as bad a making due with inadequate speakers.