Considering your age, I would suggest you to give a try to the new Marc Jacobs' scent Bang, which is quite interesting (although the bottle is a bit tacky) and it might make a very nice day fragrance. It will make quite an impression on your work mates, it is suitable for office days or weekends, and it goes for about 50/60 USD. For nights out you might want to try Dior Homme (bit more expensive, it goes for about 70 USD), on a young man it is quite sensual and intriguing. I suggest to keep in your cabinet a bottle of Mugler Cologne as well. It is just a lovely clean cologne that you might want to wear for a change every now and then.
Happy fragrance hunting!