Congrats on the house.
I just had my floors redone last fall. Mine is a (tiny) hundred year old craftsman style bungalow, so I elected to have the original fir floors refinished to a period correct, rather than perfect finish. (There was carpet covering the wood when I moved in.)
I had a guy come in and do it for me. He filled the bigger gaps with similarly aged fir, and the smaller gaps with epoxy. He then applied a very light stain and sealed it. The floor has great character now, and totally changed the feel of the house. I like the slightly rustic look, as it goes well with the architecture.
BTW, I got a screaming deal, IMO. I think it was something like $1000 to do the living area, which is around 350sq ft. (told you it was tiny
) He came in on a Monday morning and he was done by Wednesday afternoon. Considering that I would have had to take a week off work, rent/buy supplies and tools, and learn as I went, there was no way I could justify doing it myself.
Do it before you move in. We're still finding dust in strange places, 9 months later.
Jim