There's nothing wrong with the SM57!
Everyone needs at least one. It's an inexpensive, high quality mic, that will last a lifetime. I could say more, but I won't.
Other than this:
If you read every post here, you'll come up with about as many preferences and recommendations as Carters has little pills. Not only that, but if you just buy everything that everyone recommends, without any previous base of knowledge, you will be led down many, endless paths of frustration, because you have not learned the basics enough to know what you really need, or how to use properly what you just bought.
You got the 488, which is a good choice. Now, why complicate matters with a mic that requires phantom power? The 488 has only 2 mic preamps, and it does not supply phantom power, as you have learned on your own. Nothing says that phantom power is the "magic bullet", or a phantom powered mic will necessarily give you any better results than a dynamic mic.
Get the 57, use it with the 488, and learn the ropes, before you step off the deep end of gear consumption, with phantom powered mics and external preamps. Stick with the basics, first, otherwise, it will be money spent & gone down the drain.
I've been home recording over 22 years, and I don't yet have a single phantom powered mic or external preamp. The Tascam Portastudio and SM57 does it all.
Learn a bit more about basic recording principles, and the associated recording hardware, before you go headlong into buying everything someone says you "need". You don't need condensor mics, phantom power, external mic preamps, or even DI boxes, to make good recordings with the Tascam Portastudio. It's all not necessary. If you knew that, I wouldn't feel like I have to tell'ya, point blank.
I've read all your posts, and this was my summary response.
