matching center channel to mains/rears


I am getting a new HDTV, been out of home theatre for a long time. I need to pick up a center channel. My mains are Martin Logan Summitt's. I am looking to find an adequate center, as the "best" seems a tad pricey. Is there any loss in switching to a different brand of center, say going to a B&W? Also I'm using an old set of Vandersteen 2ci's for rears.
joeb
I agree with the prevailing wisdom so far that matching your center to your mains is ideal. Having said that, my center does not match my mains, and it has not bothered me at all. I think part of the reason for that is that, as a generalization, the program material is different in the center than it is in the mains. Yes, sound effects that pan across all three channels will have greater discontinuity if you use a non-matching center. But what are those effects? Car drive by's and the like. How important is that to you? For me, not very.
I’d be curious to learn how many guys & gals that don’t have separate 2 channel and home theater systems change the center speaker when they change the front speakers. My center speaker is a Monitor Audio Silver, and on my journey to TAS, I’ve paired that with Monitor Audio 10’s, ProAc’s, Acoustic Zen Adagio’s, Usher BE 718’s, and now Focal BE Micro Utopia’s. With my Theta Casablanca II, I’ve never had a problem matching the new fronts to the old center.
Two more considerations:

1. Room correction software can aid a bit in speaker matching, making a non identical center blend better.

2. If you do get matching pieces, they might be easier to sell as such later, but in reality the matching may hold you back from spending more elsewhere in your system now. i.e. putting the money saved from "lesser" center into better mains, cables or just movies.
The most important speakers to match are the 3 on the front. In order to be matched correctly, the drivers should have the same size and made of same materials.