I can only recommend my long teng 268. It's not the newest, not the lightest, but it is cheap, and i'm so incredibly pleased with it.
Bear in mind that velobuild is a broker, while long teng is a factory, for example. So value wise, the broker has to eat, and so does the factory. if you go factory direct, you trim a layer of fat.
I've put over 8k km on it, i'm faster on the flat and downhill than pretty much everyone i know, and i ride with ex national champions. And to be clear, it's not me, it's the bike. It's just easy to get to 40kmh, and to stay there, with a bit of effort. With older bikes, that would have meant a vo2max effort.
Now obviously i'm not saying it's magical, but i'm saying that if you build it right, it can be fast AF.