Tried and true Gillette fusion blades. The only downside to those is that after the first use the blades get really dull quick in my experience. I've been lurking on this forum for a while and have seen a lot of conversation about Dorco blades. I might order some off of Amazon in the near future. I have seen them on e-bay for dirt (and I mean DIRT) cheap. But to me, that reeks of someone selling stolen blades, and I couldn't in all good consciousness, support that.