This is a pic I found online, which I found to be true when doing some samples on my red oak floor. If you want water based you might want to stain first or add a tint vs just the poly on oak. Oil mellows some vs water based will not change in color. Here is a link that might be useful: pic

Buy only top shelf wood floor finishing products and you will have an attractive and durable floor. Something like Traffic or an equivalent two-part finish. I've been doing wood floor finishing with Traffic for almost a decade now and my floors hardly show any wear at all. For the lightest effect, seal with the companion sealer, either BonaSeal or Bona DTS. Bona now has a finish available here called Novia. It is self-sealing and environmentally sound, whatever that means in real life. I know little about it.

This is an old post so I imagine this has long since been resolved for the OP, but since I just saw it, figured I'd throw our experience in anyway for future searchers on this topic: We have an interesting case study in that the floors in our house and our neighbors' identical house were both redone about five years ago (before we were on the scene, so don't know specific products used). The floors are identical hundred-year-old white oak installed at the same time (same family built both). Both were sanded down, neither was stained, and ours was finished with a water-based finish, theirs with oil-based. Both still look fine five years out (if you ignore the scratches from our dog!) but the looks are different. As someone noted above, the oil finish is a bit warmer and much shinier. I think it's fair to say it looks newer as a result, though how much of that is the wear-and-tear we put on our house (significantly more than our neighbors!) is hard to say. Our water-based finish is more matte-looking and pulls out more browns and beiges than yellows and reds (if that makes sense). There are apparently some differences in how you can clean and touch up the two finishes as well. (We use Bona hardwood cleaner on ours, which seems to work fine.) Anyway, just food for thought on this!

Oil based finishes impart that amber tint. When water based finishes first appeared, the lack of that amber tint created enough of a different look people were bothered by the plainness. Now, stains and tastes have changed enough for folks to accept the lack of tone. In your case, you want the water based type. Using a water based finish over the oil stain should be no problem. Just follow the instructions from the manufacturer of the finish you select. I've used MinWax poly for floors(different than regular poly?), but I used the oil based variety because I wanted that amber tint. There are several types of Bona floor products.