JMHO, but cost can still be a big consideration. I think the RS1 and PS-500 hit the sweet spot, although the price is still high for new vs used. They are both top-tier headphones, but they don't combine sky-high costs with the strange traits that seem to come with the GS-1000 and PS-1000. Many prefer the PS-500 (HF-2) to the RS1 these days. It's really a personal decision - more deep bass and a bit less high-end extension with the PS-500 vs. the articulate highs of the RS1. IMHO, both have wonderful midrange and both are very fast.