The guy who taught me to build wheels uses the methods from The Art of Wheelbuilding. Now that I know these I tend to stick by them so not to confuse myself. I do have a copy of the PDF from Roger Musson (though it wasn't £9 when I bought it!) and reading through it I find the methods he uses easier to make mistakes with. The way Schraner laces a wheel means once you have the first 3 spokes in the wheel it is pretty impossible to get it wrong unless you are paying no attention at all (once you have the hang of it that is, at first everyone makes mistakes).
Musson does give a good drawing of a DIY wheel jig which could save you a lot of hassle and money if you are good with wood and intend to make more than just the occasional wheel.
I have never looked at Sheldons wheel guide, but its free so must be worth a look