JJ440

All idears/ opinions are very appreciated.

Hi everybody, Thanks to this forum I bought a pair of RF-62's and have been enjoying them for the last couple of months. I didn't go for the 82's because I thought they would be a bit overkill and fortunately I was right. (small app.) I'm planning on setting up a 5.1 HT, in steps, so my eyes and ears are always open. Regarding the surrounds, I was planning on getting the RS-52's, but today I stumbled upon a used set of RF-15's which I believe are the predecessors of the RF-52's? They're going to cost me 200 dollars (€150), which is not a lot. I haven't seen a cheap set of RS's ever, new ones are gonna set me back 800 dollars (€600). Should I get the RF-15's or is it a bad idear. What's the general opinion on using fronts as surrounds? I have even read that somebody preferred the RB-81 over the RF52. The speakermodel was produced between 2003-2006, so they should have some life left in them. Please let me know what your take is on this? Don't know what to do [^o)]