I wouldn't suggest buying off-brand rotors unless you have researched the brand and know they are actually made by a reputable company. I have had too many bad experiences both first hand, and second hand, with cheap rotors.
In reply to the $129 e-bay drilled and slotted, I would just go with a known brand drilled or slotted (to keep the price down) instead b/c wouldn't it suck if those warped the first time you used them and the only way you could return them is through mailing one back through UPS? Sure they could be alright, but I would buy them from a well known store (if online) and at least a decent brand.
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