The Typetester is an online application for comparison of the fonts for the screen.
A great and handy tool for any designer, a must when you’ve got lots of fonts and don’t know which one to pick. Go and check it out!

If you don’t want to spent money on fonts there are always other options like using free fonts.
Dafont.com & 1001 Free Fonts are just two examples where you can find a great amount of free fonts.
But they’re not all that good in quality. So it’s hard to get yourself a decent free font, that’s why smashing magazine picked 40+ Excellent Freefonts For Professional Design from all around the net. And they still bring you monthly, Free Fonts Of The Month.