Hell,
You can purchase C&C via Amazon for just under $13 for each of the core books (the 2nd Printing PHB answered alot of the complaints of the 1st printing) and I think Amazon still has an offer for "buy both" for around $25.
This is a sweet value, and despite those decrying it C&C IS an OGL/d20 product - just essentialized to its best core values with a better integration to the style and flavor of 1e. As a starting base, it's always easier to ADD house rules that expand some area not covered in the rules rather than convincing your players to IGNORE something that is in front of them... I can't name how many times when running 3e I'd make a ruling and the game would stop as players opened their books (which surrounded us like a disheveled library) to point to why I was wrong. C&C doesn't have feats - excellent by me as I view this as symptomatic of overpowering PCs, but if you like them ADD them back in - it's simple to quickly create your own feat progression and take what you like from other systems. Skill checks? The C&C SIEGE engine wipes it away and uses the 6 basic attributes as quick and simple common sense skill check modifiers. There are also supplements and "secondary skills" material being bandied about the community. The upcoming Castle Keeper's Guide (which won't be a core book, just an expansion supplement for GM's) will offer a bunch of other varients. TLG just recently published their pdf with multiclassing ideas, and there are varients on this as well.
Those who say "oh it's BASIC D&D" are really off base - as I sit here I have the 1e AD&D phb and my C&C phb and they are quite similar, although to me C&C cleans up the cumbersome attributes of 1e and marries in the d20 SRD rules that really make sense. I will say be sure and get the 2nd PRINTING - I suspect that many who say they don't like C&C say so based on the 1st printing, which was rushed a bit and a little less than desired in terms of a published product.
"Turn back from the ways of the Dark Side...."
Give the Crusade a try, and you might well be surprised (especially as I said at the top - $25 bucks at Amazon gets you both core books).
And with all the Ptolus-mania, I will plug Gary Gygax's Castle Zagyg: Yggsburgh setting for C&C - it is excellent! There is also growing adventure/module support not only from TLG, but from Goodman Games, free stuff via Drangonsfoot and other sites.
John