It does depend which wheels you're building. Many plain retro-looking rims are cheaper to buy pre-made, but obviously you don't get your own choice of hub, spoke and rim. That said, I've not seen retro-looking rims that are £360 and up. Had I put higher-end track hubs in my Velo Orange rims they still would have clicked in at well under £200. I think mine were £120 in total.
i'm using ambrosio hubs. If i'd gone for circus monkeys, i'd have saved 42g rear and 23g front, for an extra £20