This is a question with a lot of answers
YouŽll need a stone around 1000-2000 if you are going to do some bevel setting, For mid range stones I would choose 2 stones between 3k and 8k, and a polisher between 12k and 16k.
So 1k > 4k > 8k > 12k Would probably be a sensible setup.
You could fully hone a razor using only a 4/8 combo stone, and get a super shave http://straightrazorpalace.com/honin...on-2012-a.html
Some people only use the Belgian coticule.http://www.coticule.be/
Some people even use Shapton 1k 2k 3k 4k 6k 8k 10k 16k and 30k to get the perfect BBS shave.
So you see, thereŽs a lot of stones out there, and a lot of people with different preferences