This may seem like a no-brainer to some of you, but I'm not as technically sound as some of you, so here goes. I am using two bookshelf style Mission speakers as my fronts. I've only had them for a year and didn't want to spend any more money then necessary. I then purchased two other Mission surrounds and a center speaker. Now when I took the package home there was no specific center speaker, rather just the same bookshelf speaker as the other two bookshelves. I believe it's the 700 series. Should I go back to the store and ask for the specific center speaker? It's a 70c1 I believe. The bookshelf speakers deliver a solid sound as far as I can tell. It's hooked up to a Yamaha V596 and I'm also using a Polk PSW250 subwoover. I'm just not sure how important this component is, given the overall package I'm using. Thanks.