I've had several different models of Klipsch' over the years, but never any with "foam" surrounds. The surrounds on mine have always been rubber, on woofers and passives. I have seen cracks in the rubber of some (bought used), but nothing that I would consider rot. I've owned the KG4s (one of my all-time favorites), KG2s, RS-3s, a KV-3, KLF-C7, SW-8 and KSP1.2s.
I also disagree with those who say "all Klipsch' sounding brite". To me the earlier models (Heritage, Classic) are very well balance and are very involving with classical music. My bedroom home theater includes most of the speakers above (not the KG2s or the 1.2s) and are driven by a Yamaha RX-V2095 and sound great. My living room theater includes Legacy Focus, Silver Screen center and T&A P-30 surrounds driven by a Denon AVR-3300 and Yamaha M-65 (bi-amped woofers on the Focus) which is also an excellent sounding system at a considerably higher cost and many like the Klipsch/Yamaha system as well, if not better than the Legacy/Denon system.
I can fully recommend the Yamaha/Klipsch system with either the KG4s or the Fortes. Your RX-V3300 is very similar to my RX-V2095 in power and features. I recommend the KV3 as a better match for the center. I tried the KLF-C7 thinking the 8" woofers would be a better match for the 8" woofers in the KG4s, but I thought it didn't mesh as well and sounded as though the dialogue was going over your head no matter how much it was tilted toward the listening position.