Save your money. $200 won't get you anything good unless you get lucky and find something on eBay no one has bid on.
Roland SH-101. $600-850 classic synth great sound.
Also, check out ( super collider )
"real-time audio synthesis and algorithmic composition. It is an efficient and expressive dynamic programming language which makes it an interesting framework for acoustic research, algorithmic music and interactive programming"
I have some friends with droid cell phones that have this program on their phones. They code and make cool noise,
Just saying...I don't code but I think this is a neat program worth checking out if your into noise.