Toaster,
Unless you have big ears, you might be interested in trying a Sugden Headmaster combined with the A or W1000 headphones. This amp sounded wonderful, and it costs less than the Corda Prehead. Unless you need the crossfeed, I doubt you would go wrong buying the Sugden as it is a very great sounding amp. WIth this smooth amp you could go with either the W1000 or CD3K with no problems. Myself and AC1, who owns the amp, tried the CD3K thru it and were impressed with the sound. Harsh, shrill, or otherwise in the high-end it did not have at all. And AC1 listened to these cans before and didn't like them.
I auditioned the K1000s for only about 5 minutes, so keep that in mind when you read this next part: I liked them, but found that they lacked in the bass department. Maybe it's the distance that the earspeakers sit from the head, but others here have bought a separate subwoofer to use with their K1000s to bring the bass back up.
All in all, whatever cans you choose, A/W1000, CD3K, or the nwe Beyer 880 will sound very good with your setup. These are all very good cans. Let us know what you buy and how you like them toaster!!