I would get one modeled after a famous vintage one, if you like that sound.
They show you where to run wires and stuff, not so much "here's a schematic", and they seem to use pegs you attach leads to and run wires, not so much PCB boards.
They probably are the best route to save a bundle of $ and have a good result. I've got an unassembled kit. It belong to my boss from 3 years ago who has literally never given me any information to finish it... he told me he'd call several times. Perhaps I'll assemble it how I want to give it to him as a surprise, since he just doesn't pay attention.
If you decide to buy one you can PM me about doing a little something special to make it be a power source that makes all the gear sound superb. I've been thinking about this for awhile...