I just bought the AT 2020 and it was certainly inexpensive ( $100) compared to most LDC mikes. Not top shelf but an big improvement over a SM 58 for sure. I can distort it if I scream at it in close proximity. But it certainly sounds open and transparent. I'm getting an excellent vocal these days with it and my Joe Meek threeQ pre amp.( $240)
You can use your interfaces pre amps, most are fine, but I'm now sold on using dedicated hardware pre's for vocals. I made this big upgrade with those 2 items for about $350. Money well spent.
I also have 1 Beta 58 which if you only owned one mike for studio and live would be a good pick. I use it mostly live but on certain clients it's a great sounding mike in the studio.
Some people make to much noise around LDC mikes. You need good mike technique to use a LDC.
SM58 are possibly the most dull sounding mike I've owned , I have 3 of them for doing live sound. If I had the money they's all be Betas. I also have 3 x SM 57's, all have wind socks permanently attached. I often use those for live vocals before I'll suffer a 58. 57's don't have a pop screen so a wind sock is required for vocals.
MXL mikes are the worst I've ever owned,,, I was an idiot and bought one from a second hand store I thought I had a bargain at $50. It's worthless. I can't even sell it for $10 on buy and sell....
I am also very happy with my small collection of CAD mikes I'm scoring from Musicians Friend stupid deals. They are amazingly good. Not sure what the vocal mikes are like as mine are all small condensers.
But check out the AT 2020 I think you'll be happy with it. And with the money you save check out the Joe Meek three Q. The optical compressor is amazing for evening out a vocal track. And the EQ is top shelf stuff. It also makes a great bass pre amp. I can leave both my bass and the mike plugged in and toggle using a button.