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My first and still best razor was a 6/8 Taylor's Eye Witness round point, stiff full hollow. Most of my other top performers are 4/8-9/16, but I do have a couple of good 5/8-6/8 that are right up...

Either 5/8 or 6/8. 5/8 is a good size for any kinda stubble and 6/8 will give you a taste of the larger blades without going overboard with size/price.