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5/8ths is the most common width. Anything from 5/8 to 7/8 would be fine to start with; 4/8 is a little small and a bit tricky to hone, while 8/8 is a bit heavy.

They look fine. Revisors, TI, and Dovo are all good to great razors. I bought my first razor from altima55 and was quite happy with it (still have it).