Soooo, I have a chance to purchase a mint 18 month old MC452 at a good ($5k) price. I am currently very happy with my pair of MC2205 amps run in Mono configuration. Currently, my main speakers are the Aerial Acoustics 10TmkII. Beyond an amazing jump in current and a much lower noise floor, just how big of a upgrade is the MC452? Should I pull the trigger on what would be my forever amp? Can I do much better than $5k on a MC452 these days? TIA!