Like ElDiabloConCaca said-
Get it now, or you'll be late to the game.
I have been using X as my primary OS since before the first "final" release came out, and I have had no reason to not use it. Any apps not carbonized yet will be soon enough, and they work fine in classic.
I am really glad that I got X right away, because having a whole summer to play with it as it developed not only has helped me become a proffecient user, it has helped me to appreciate all the work that has gone into it, and just how great it really is. This is the MacOS of the future- learn it now and stay ahead, or learn it later after falling behind; either way you will have to buy it, use it, learn it, live it.