Just my opinion
I found the 4033 to be too colored, like too "trebly" or something on my voice when I tested it ... but I heard it's great for guitar cabs and some like them as drum overheads. Have you had the oppty. to sing thru one at a local store? It's probably different on male vox and maybe better than the results I got.
Because of the results my test yielded I don't think the 4033 would work as an all-round mic for me. I would try it on guitar cab and drums, but I'd know I couldn't use it on vox.
I've heard the C1 on Alan's demo CD. Based on that, it was decent but didn't really jump out at me as great ... Now the C3 ...
The C3 is supposed to be the same, I think, just more polar patterns. But it seemed a fuller, more detailed sound, at least to me. I also noticed that the higher the mic quality went on that CD, the more apparent the differences were between the mic pres used (the CD demo'd the C1, C3, and T3). Maybe check out a C3?
You mentioned you were looking at the specs of the NTK ... a friend of mine has one and she *loves* it. I'm going to be demoing it shortly, but if that type of mic is also in consideration, you could also look at the SP T3, which I thought did in fact sound the best out of any mics demo'd on that SP CD.