Parallel Programming == Network Applications Programming. Very important if you intend to be a developer. Understanding thread safety and concurrency goes a long way.

I would go for Computer Networks and Operating Systems
By taking these two you would learn pretty much every basic important computer related thing. Computer Networks gives you a pretty good idea of how every machine comunicates, and OS gives you the idea of how the machine works with itself.

did you go to uiuc? lol

Lucky! I wish I went to a more programming oriented university. At least it's cheap..



I see. Would you say that and databases are probably the most important for being a developer specifically?


Even if OS is mostly just theory?

Out of the elective you listed, yes. You will be at a disadvantage in the workplace if you do not have a firm understanding of concurrent programming and relational databases, as these topics will be used throughout your career ad nauseam.