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Hey Steve,
The best mic depends on what you're looking for -- if you want to sound like a radio DJ, you'll want a condenser microphone, but they are typically more fragile and require phantom power (which the DJM-450 does not provide). A lot of DJs will tell you that a bulletproof dynamic mic like the Shure SM58 is the best they've ever used, and they're not wrong; it's a basic and inexpensive workhorse that sounds decent. If you're a vocalist, you might want something a bit more specific to your needs there.
Lots of choices on the market, but do a bit of reading and hopefully you'll find something in your budget that does what you need. :)