Maybe I am miss-reading your post but the K-300i was the very first XD amp. It was the gateway drug for me to move up 1 rung up on that lineup (175XD) and MAYBE I can afford to move to the top with the new KSA i400.
That amp maybe going up in price due to rising costs of the metal casework (some supplier bad faith going on there). Anyways, if it all works out, I will have KEF Blade 2 Meta with the KSA i400. Both the 300i integrated and 175XD stereo amp I sold need more power for the Blades in the room I will put them in.
BTW - There are 2 300XD on USAM for around $7K and under. This amp would work great for me, and I will get this if I cannot afford the i400.