I started off using my wife's Gillette Venus blades, which is only three blades. They have newer cartridges that have five blades, but we never used them. If we don't have the Venus cartridges, we started using razors that we bought with three blades at the Dollar Tree. There are only three razors in a pack, however. They were only $1 so thats only 33 1/3 cents per razor. I've never used a blade with more than three blades.
My headblade has a Women's Gillette Sensor blade, and put on backwards, (pulling instead of pushing) due to my very senstive skin. That cartridge has only two blades, but I think it works just about as good as the Dollar Tree razors and the Venus. In my opinion, three blade razors work slightly better than two blade razors, but the two blade razors still do a great job.