One of the things I like about Troll Lord Games is that a couple of times per year, they have absolutely killer sales. Right now, you can pick up the Castles & Crusades Player's Handbook for only $10, a sale they have extended through April. You could also pick up the leatherette version of the PHB and their Monsters & Treasures for $10 each as well, and their other supplements are nicely reduced in price as well.
I also noticed they have slashed prices similarly at RPGNow, so that's one more option if you're looking to give the books a try. I like Castles & Crusades as sort of a "meeting place" where I can incorporate items from older editions of D&D (and their simulacra) as well as from the vast array of d20 goodness out there, and it's also sort of a compromise for my players and I. But I've written about all that before.