Please bear with me, I am new to HT and Audio and have tried to gleam information from other threads. Any advice is appreciated. I currently have JBL MR26 bookshelf speakers up front and some KLH center/surrounds that I got for free with my receive 8yrs ago. I just upgraded my receiver to a Marantz 5300 and was looking at getting some new surrounds and center speaker. The JBL S36IIPM are on sale a Best Buy for $150/pr and was considering picking them up. Should I put the S36's up front and then move the MR26 to the back or should I replace the MR26 and use the new speakers front and back. Also, from other threads it seems the S-Center is impossible to find and so I might want to get a 3rd pair to use as the center front and center surround. (or use the MR26 as a center?) I also have a 10" BassCube from cambridge soundworks. This is mainly for Home Theater usage. I currently listen at -25db from reference and am looking for a more unified sound. Am I going to want to upgrade the front speakers to larger floor models at a latter date? or will the S36 plus sub keep me happy?