As I understand mic building in this range, the diaphrams are built in China, and the vendors buy them in lots. The better ones go in the higher end models, the less to spec go into the cheaper ones. So fundamentally they start the same and have some differences in the electronics (be they solid state or tube).
I don't think you'll find a huge difference between mics in this range, though different mics will sound different on different people...that's why studios usually have a locker full of them. Also despite all the marketing hype I don't think you will find that $4000 Neumann sound in a $600 mic, but these mics will certainly hold their own. I don't think you'll go wrong with any of them, but its worth trying them all if you can on your voice.
I purchased the T3 based on some recommendations from a couple midrange studios. I was looking for more of a "jack of all trades" mic and this one fit nicely. I'm pretty happy with it, it's clear and has good detail and doesn't get harsh like my MXL990 can. The polar patterns make it pretty versatile and also change the response somewhat, and I've found that can help some with smoothing things out.
I use a Focusrite Saffire for the preamp and converters and that certainly adds something to the sound in my opinion. I record with a cheap pop screen which probably takes a little of the air out of it but I haven't had any sibilance problems across several people I've recorded. Finally I use a SE Reflexion filter to keep the room out of it. Overall it's solid for what I'm doing, as I expect a Groove Tubes, Blue, Rode etc. all would be.
I think Mickeymix has a Blue Tube condenser, maybe he'll come along and chime in on his experiences. He has a more airy voice (some would say...seductive

) so he would be a good data point.