Speaker line should be around for a couple of years until they come out with a new line. You can go with another pair of rs 52 for 7.1 to match your system or give Klipsch a call and ask for there recommendations on a pair of bookshelves to match your system. For the sub, you can always buy used or another brand. Some people use hsu, svs, etc. You can used the pioneers for now as 7.1 and then when you get more cash, buy matching surrounds. Take a look at thx.com or dolby.com for speaker placement.