What center to use?

avib

Hi,

I'm going to built a system with:

Receiver: Onkyo TX SR606
Fronts: RC85i
Rears: RC80i or maybe RC85i as well
Sub: PSW10

Now the question is what to use for the center.

Should I buy another pair of RC85i and use one of them ?
If so, what to do with the other one? Rear Center?
Is TC265i reasonable choise for center? It is more expensive from a pair of RC85i.

Is the overall setup reasonable?

Thanks,

Avi