Hi Diego, For a wood option I would talk to someone like Tim at Beresford's regarding a new top. An affordable way to go would be to think of using a good quality plywood faced in a birch, maple or even a simple white laminate. All of those choices would be quite a mid-century appropriate way to go (very Charles and Ray Eames). For marble there are literally tons of suppliers out there (you might like to check Marbles of Portugal) but the big thing to consider is if you go with something like a Carrera marble that it will take care and the correct sealers to keep it looking perfect. Red wine is not your best friend with a white marble table top!

Cheers, Arren