SM 57 is the way to go for the trumpet. The Yeti has a good reputation, but I haven't actually used one, and they're not as highly recommended as the 57 for instrument recording. The 58 is a great vocal mic; but when you factor in the trumpet you're better of with the 57--the X2u is the adapter you need for USB function--but if you get an adapter you can plug it into the microphone input on your computer.
For the trumpet turn the gain down low and get close to the mic. Don't get me wrong the 58 will work, but the 57 is a better vocal mic than the 58 is a trumpet mic. You don't have to buy software--Audacity is free and works well.
So, for the price of the mic and the adapter you can start recording.
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