Thanks for the prompt replies everyone - really appreciate the amount of great info and the helpfulness around here!
Well I ended up buying both (I hoped that swapping the capsule of the NT1A would be an "easy fix", but it sounds like I might be better off with other options... anyway, at least I'll have something to compare with).
@micolas - yes, that's the one.
I guess the question is how much it makes sense to replace the capsule with a more expensive one, if there are many other issues that might be more difficult to solve. I got the impression from diymicparts.com that a capsule upgrade could mean night-and-day, but maybe I would be better off starting with a completely different microphone?
@SubSpec thanks for the link - looking forward to listening to your comparisons... Microphone comparison is a quite addictive beast! Actually (judging from pictures only) I think the AKG mic looks much more cheap, but maybe that's on pictures only.
If I change the capsule of the NT1A, would the stock capsule be useful in something like the ORS87 (e.g. with a low pass filter to tame the highs, or is it simply too bad sounding altogether?)