they are only making 2700 6 speed CL's in its first year... most or all of them are probably already spoken for. I am not sure if the 03 Accord tranny would fit, but thats not gonna be available for a while yet. You'll probably have to hold your ass for a while untill wrecked 03 CL-S's start showing up... which might not be too far down the road judging how ****in fast they are!!
One thing to keep in mind... either way, it'll be EXPENSIVE... those trannies are in HUGE demand... everyone that has a 6 cylinder honda and knows the value of a manual wants that tranny.