Andrew R Stewart 

And I'll add that using cheap parts in one's first attempts to build a wheel can be a frustrating experience. Wheel builders who cherrish their reputation often have minimal standards of rim condition before they will lace up that rim. The resulting wheel's life is greatly effected by the rim's allowing consistant and proper spoke tension around the entire rim. Finding out that a rim has a flat spot or a bit of potatoe chipness as one tries to tension/true up the newly built rim can be too late. Some sources won't accept a rim's return after it's been laced up (tensioned or not. Much like auto electrical parts or glued sew up tires). Andy.