Hi, I am just in the finishing stages of my 401 rebuild. I had my plinth built for me by the maker of my custom speaker enclosures. It is the first plinth built by them, and although it's nice, Chris Harban of Woodsong does an incredible job on his plinths, but they are also more expensive.
For a tonearm, I bought, coincidentally, from Chris Harban, a Dynavector DV 501. I then had it rewired with teflon dialectric silver. I installed my old standby, a Dynavector XX2MKII cartrdge. I'm just now starting to get it dialed in, but it really sounds good, to my ears.
I did the restoration myself, with all new springs, spindle bearings, grommets, etc. I stripped the table down, and bead blasted the top plate, and then had it powder coated a gloss black, which I prefer to the drab beige color of the original.
If you are a bit handy with tools, this can be a good DIY project. Otherwise, I think I would go with Woodsong, I found Chris to be meticulous in what he does, and the quality of the person he is. Also, if anything comes up, if you need parts or there's something else you need, he's right here in the good ole USA.
Best regards,
Dan