I actually got the mxl reccomended on SongU by a coach there, but now I did do some soundchecks, and you're right, it's quite harsh. I checked the K2 too, as I love the Rode mic's for value for money, but to be honest, that sounded harsh too. The best tube mic I came across, that was not a Neumann, was a very cheap T-Bone (the Thomann brand). Based on my research today, the Shure SM7b, can't be beat for my personal uses, below 1k. I'll try to get 'warmth' from another source than a cheap tube mic.

But of course lot's can be solved by a good signal chain and mixing, and the determination factor is how you think it sounds for YOUR voice. If you like it, you're probably more willing to put in the extra work. You don't strike me as a person who's willing to compromise a lot, though, so I wonder how you've taken the K2 to a liking?