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I've used Surly cogs in the past. They have a wider edge at the free hub, similar to the CK shown above. Appears that it'll work with 6-9 speed chains.
For spacers, it doesn't really matter - all the kits are pretty much the same. As long as it has a few different width spaces so you can fine-tune the chainline, any of them will work.
Gear ratio - I've used 40x18 and 40x20 for SSCX (700x33 cx tire) and 44x16 on pavement (700x32 slick). My mountain bike (29x2.3) was 32x16 or 32x18. I'd guess for a gravel/commuter, you'd want somewhere around 40x18 or 40x20, depending on hills.
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