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I think it's a case of working out what I want from the wheels. They're start as nice summer wheels, which would lend themselves to blingy DA, but in reality they will probably end up staying on the bike full time, so I think they'll have to be sealed. I do like the idea of a threadless cog interface like on the Halos, but I could get both the Novatecs for the price of the rear Halo, and they're lighter too. Decisions, decisions.
thross-
I think the if you want to go for threadless cogs, Halo isn't the way to go, I've heard stories of the hubs failing due to Steel sprocket fretting the aluminium hub body.
The Level cog system was awesome, not sure if its still around, the White Industries version is nice too.
I have a 6 bolt ISO setup with a Velo Solo cog onto Mack hubs. Its been on my bike for over 5 years without having to touch it.
Not a massive fan of regular threads/lockrings myself.
Keppel
Yeah, the DA ones look lovely but that's a faff!
I had the Novatec ones and found them pretty damn smooth and the halo ones I have now are even nicer to ride