I don't have a mixer, so I won't comment on that part, but both
the Shure SM57 and the Rode NT1 are good mics. The Rode is going to be about the price of two SM57s, and which ones you get depend all on what you plan to do. If you are recording instruments, like miking a guitar amp,
the SM57 is the way to go. I would say you can always find a use for an SM57, it's a mic that can have multiple uses, sometimes even vocals. I have 2, and use them more than anything else.
The Rode NT1 is a great condenser mic for the price, and is good for things like acoustic instruments and vocals. If you can compare different mics at a store, that's the way to go. You might find out your voice is more suited to being recorded with an SM57 than a more expensive mic. My point is, test the mics out if you can because you never know which mic will best suit you until you try it. Most places, like Musician's Friend, have ample tryout times where you can return something if it doesn't work out like you want. That way you can try it at home for 30-45 days.
Also, a mic preamp does help shape the sound and clean up the signal as well as bring up the mic level. Several people here use it during mixdown as well to enhance the sound. An inexpensive tube preamp would be the single channel Art($99). If you can afford a little more, look at
the Art DualMP ($250), which has 2 channels and has some nicer features. If digital outputs are important to you on the preamp and you can raise the price even higher dbx has a nice one in the $500 range.
Yuu got the right idea, learn before buying. The search feature for the BBS appears to be back up and running (thanks Dragon) so check the Drum and Percussion forum for ideas on mics for drums and good ideas to getting better sounding drums recorded. You could probably find out a lot about the Mackie and what people think of it by searching on that as well.