Cork belts in at least 400 and 600 grit, 800 is nice to have too. They make finishing LOTS faster. Another vote for the Gator Trizact belts, last a long time and are good finishers before the cork, I have the 45 and 65 versions.
I like the Blaze belts too, but haven't tried the competition, so can't recommend them over 3M, zirconia or whatever.
I can recommend Norax U936 engineered ceramic belts. I have a couple in x100 and they are awesome. Grinding the 36 or 60 grit scratches from hard stainless steel they just last and last. Unlike the Norax U243 belts which are AO and must be kept dry, the ceramic can stand a bit of damp from blade dunking and does not get glazed the way the U243s do.
I am biased towards buying premium belts because I live in the UK. Shipping is the same whether the package contains premium or cheap belts, but the premium last longer and I need fewer of them. It is also easier to store a few premium belts that last than 10 packs of something that wears out faster.
Anyway, cork belts are my best recommendation...and some green compound to go with them.
Good luck
Chris