You don't think that the white industries or phil wood are sealed bearings?
Both use rubber seals just the same as the generic industrial 6000-2RS bearings in Novateccs. Bearing in mind that Planet X are dumping their remaining stock of Novatec at £34 a pair, it's hard to see why anybody would buy anything else. No 28H, but then 28 is a weird drilling anyway, no real point to it as it's not different enough from 32H to make any meaningful difference. If you're not racing, 32H f&r is fine, and if you are then you'll want deeper rims, whereupon 24H both ends will be enough for all but the biggest riders.
Both use rubber seals just the same as the generic industrial 6000-2RS bearings in Novateccs. Bearing in mind that Planet X are dumping their remaining stock of Novatec at £34 a pair, it's hard to see why anybody would buy anything else. No 28H, but then 28 is a weird drilling anyway, no real point to it as it's not different enough from 32H to make any meaningful difference. If you're not racing, 32H f&r is fine, and if you are then you'll want deeper rims, whereupon 24H both ends will be enough for all but the biggest riders.