I think one of the main benefits of having expensive mics is that you will be willing to do a little more of the leg work necessary to get your sound right. When you are using a set of $30 mics it's tempting to throw them up there and say "they don't sound very good, but they are cheap microphones" however, if you shell out over a grand for a set of MD421's, you'll probably work a bit harder to place them right, since we all know some fantastic drum sounds have been recorded on them. Of course if it still doesn't sound right, you can always blame your preamp!
The point is, Tom mics don't need to be fancy, almost any dynamic mic will do. It's all about the placement. If you have a good setup with your overheads, it will also contribute to your Tom sound. If there's a big featured Tom part in the song, I usually mic them top and bottom, if its just fills or rolls, I'll single mic it and usually cut out or ride the fader just for the fills.
One sound investment for good drum recordings is some higher quality mic stands. The big ones on casters will go much higher and this makes a HUGE difference. Cymbals won't sound so washy or overly bright, and to me that's one of the biggest differences between pro and amateur drum recordings. Of course you will need a room with a high ceiling for that to work.
My first drum recording had mics tapped to broom sticks tied to chairs, mics on drum hardware, and mics hung over the rafters in the basement, all run into an 8 track mixer and send into the stereo input on my friends computer, but it actually sounded pretty decent, because we worked on it. So just keep doing it and it will get better each time.
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