I have heard the 225's with my Corda headsix amp and they sound really good. I have the RS-1's and in fact am listening to them right now through the headsix and they sound really really good. The amp can be had in the for sale forum from time to time and is in your price range. I am new to this so I am still learning this stuff but to my untrained ears it sounds very clean, with crisp highs and nice balanced mids and lows. Good luck.