Don't you hate it when that happens
I also wondered if the same thing would happen when I just bought my S3's after seeing the newer updates to the S1 & S5's. After some further thought though, any MKII version would no doubt put the price out of my reach so I quickly thought no more of such possibilities.
I also decided to pony up and replace my amps with a set of PASS Labs XA100.5's to go along with my S3's so at this point my wallet will be licking its wounds for some time to come
. My reasoning for the amp replacement was fear of having too much neutrality in the system given the Hypex's ultra clean sound in combination with the S3's similar nature. The PASS Amps should help to add a little seasoning to the sound if you will.
I'm keeping my fingers crossed that the "little" XA100.5's have enough juice to power these S3's appropriately given my louder then normal listening habits and fairly large listening room.