You must be talking about the Audiogon listing? I spotted that the day it was listed.

I check in a lot because you and I are in the same boat. PSB T-55s with a mismatched center.
So, I asked for the opinions of a couple of very knowledgable folks, as you are trying to do as well here.
The best advice is to go with the Image line. Its not about getting the best center speaker you can afford, but having the stage matched. You can also consider a vertical Image bookshelf which would afford you other important improvements in center channel performance. Undoubtedly, its hard to pull off in many setups.
There was one jocular fellow who thinks I should've got it just to provide impetus to upgrade my mains to the Platinum series. ehhh.... hehehe... spent well enough for now!
As for comparing Infinity with Platinum. The best match is another T-55 for a center, heh. Then next best is others in the same line. Next is something of the same brand.
I was twiddling my thumbs over the C2 because I know its going to a much better match than what I have now. I might reinvestigate the whole upright bookshelf possibility. It was not possible last I checked it out, but Im going to double check. Want to split a pair of PSB B-25s?
Good luck, and keep us updated. Get an Image center, if you can't implement an upright B25/15 or T-55.
-jostenmeat