Both schematics will work. You'll have to get the cap values from the ChuckOnTech if you wanna build the MAX232 Arduino one.
but if you look around, there are MAX chips that don't require the caps; they're built in. DigiKey should have the part, off hand - I don't know which one it is, but I'm sure someone else will know.
And if you still need D0 and D1 for USB debugging, you can use any other D pairs to connect to.