I say figure out what you wanna do more, and then work from there. I myself wanted to mix music, but also toss in some controllerism and flair to songs, so I got a controller (Traktor S4), and a Midi Fighter…$1,000 and $200, so waaaaaay above your price range, lol.
If you’re gonna get any decent controller, you may end up paying a bit more than what your budget currently is, so I’d say save if possible. The launchpad itself is more useful with Ableton versus any of the more traditional DJing software out there (Serato, Traktor Pro, VDJ, etc..), so if you wanna mix music, look strictly at controllers.