It's really hard to advise someone on what kind of strings to use, because the strings that sound best on my guitar may not sound that good on yours. Every guitar is different, even the same model by the same maker. The only way you can determine the best strings for your particular guitar is through experimentation. It's a long process and it can get a bit pricey over time, but once you hit the happy combination, it's worth it.

Flat statements like "D'Addarios are the best" or "Augustines are the best" just won't wash in the real world. Read the Classical Guitar String Basics link that Mark posted. Good info there.

Don Firth