Thanks for these first replies (I never heard about those Audix, I'm gonna check, the K2 is out of my price range). I need to add that at the moment I
have one mic, which is the AKG Solidtube recently bought as used, but I have a chance to sell it for the same price. Since I've read many better comments on much cheaper mics, I thought selling it could be a good move, and with that money buying one good and versatile mic or even two (one in the SM57 price range, let's say 100$ and the other one around $200) if that's the case.
Of course, if from the description I've given, you think that I should keep the Solidtube because it fits better than many others for my voice, well, I could obey my gurus