RJ4489

I currently have the following 5.1 set up in a small living room: Front KSB 2.1, Center KSB C1, Rear KSB 1.1, Sub KSW 150. I just moved into a house with a dedicated media room. This room is larger, and I was thinking about adding two floor standing speakers to serve as the front speakers. I would then make the 2.1 speakers the surround speakers and the 1.1 the back speakers in a 7.1 system. 1. What speakers would be a good match to use as front speakers and be a decent balance with my old stuff? 2. Would you recommend an upgrade to the center chanel speaker as well? Thanks for your help and input.