Deniz, you might give PMK pyro a try if you are planning on doing enlarging. It is inexpensive (a roll of 35mm costs 12 cents US to develop), lasts a long time on the shelf and is a one shot developer so it is always fresh. If it is for your 8X10 and contact printing, then pyrocat-hd would be a good choice as it has shadow detail which won't look as murky as PMK. See some of Francesco's prints in the gallery for an example of what is possible with 8x10 and contact printing.
There are lots of good developers out there and the Darkroom Cookbook would be a good place to start. I had no intention of mixing my own chemistry, but after seeing how easy (and cheap) it is, I'm glad I did. Bulk chemicals are very inexpensive to use. If nothing else, buy the chemiclas and mix them up at your lab in school. That way you only need to pay for chemicals, which are very cheap and last a long time.