Richard,
Storage is not really an issue. The shot I’m concerned about is rather brief (the whole film is under a minute, in fact). The tricky part is that it’s handheld, half the room is green, and I’m going to need to matchmove a bunch of objects. Hence my intention to keep as much of the data as possible, both resolution and color sampling-wise.
I do have an Aja IoHD, as it happens, but in my experience, ProRes has been somewhat lossy. No horribly lossy, but noticeably so, and I really don’t know if I want to deal with compositing and matchmoving something that went through ProRes conversion.
Sounds like 2K is the way to go, unless someone here (or on FCP forum, thanks for that referral) will explicitly warn me about processing 2k on a Mac Book Pro.
Thanks again!