The biggest thing to know about inexpensive Reference Microphones is that the more money you pay, the better HF Stability you're going to get AND the more alike they are going to be mic-to-mic. In the price range you're looking at, the EMM-6 is really the best option because of the curve correction. I bet if you took all 3 apart you'd find the same Panasonic electret capsule and mostly the same case designs, but Dayton has gone to the effort to measure each
microphone and that's worth the cost.
For timing and quick tuning, they'll get the job done, I'd prefer something that I know needs less correction if I was to expand the kit down the
line but if you go in now on like 3 of them and treat them like starter mics to learn and get your feet wet then when you're ready to upgrade and expand your kit it'll be money well spent on valuable tools.
I own Audix TM1+, and when I rent it's generally DPA 4006's or 4090's -- for my personal kit I wanted something that holds up just a little better than the Behringer stuff, and for rentals it's important that I know that mic-to-mic things are probably going to be alright because I probably won't have the calibration files and the most calibration I'll get is an SPL Calibrator.
As for damaging a TC40...I've dropped plenty of M30's in my life and never destroyed them -- that must have been some fall!