Any chance you will be doing the rest of the house in the future? If the rest of the place has the oak flooring in place, you might want to get a bid from a pro company. The finish they use is much better than any polyurethane I've found in a can.
It's a pain to prep the whole house for the job but the results make it well worth it.
'03 KTM 450EXC
"If you know what you're doing, then you aren't learning anything." - A. Lincoln