I guess that depends on where you source said items, i.e. brake lines which you can get cheap or go for Spieglers which cost 100 bucks, and it depends on whether you want to replace everything or determine that some things aren't in need of immediate attention. I'd say the main thing would be tires which can be gotten cheap if you're OK with Shinkos.
I posted them here because they're in the price range most people would consider reasonable for a running k-bike and because they're in allisonmo2's geographical limit.