Honestly, Vex's three rules amount to pretty much the original rules Hawk set out, outside of the addendum that author's have a slight say in how their threads are run (whether off topicness should be kept to a minimum, or free reign to speak about anything and everything even slightly related to the story). However, from my view point, not only do we have three levels of how expansive the rules should be (minimal-something along the lines of Vex's three rules, with a slight addendum giving some examples, moderate-the above mentioned "something in between", and extreme-highly detailed list of what is and isn't acceptable on the board that PCHeintz desired), but also whether we wish to be lax or strict with rule enforcement. Essentially, not only should we be voting on the number of rules, but how active we want mods enforcing those rules.
The rules Hawk set out were there, but with how little Hawk was around, they generally weren't really enforced, and even then, only in the most severe of cases, or when a trend began forming among the forum members like the string of "You fail!" posts that got on Hawk's nerves. If we wished the board to remain the same, we'd likely want minimal-lax, but there isn't anything stopping us from going with a more detailed set of rules and simply not enforcing them as strictly.
As for my own personal opinion, I'd prefer something around minimal/moderate-lax. I'd prefer if mods didn't hop into topics giving warnings at every opportunity, but simply popped in and mentioned to a poster that they were kind of being a dick and shouldn't be.
Edit: And in line with Vex and rdde's comments about starting off with minimal rules, and my own desire for the rules to be not as strictly enforced, I'd prefer if we started off with only a few mods and added more if we really needed them. You can always add more mods down the line, but kicking mods out because we chose too many seems like a dick move.