we used os hardwax on our heartpine.

Our heart pine floors have had water based poly on them for about 16 years (although not in the kitchen) and they have held up amazingly well. No kids, but a DH who refuses to remove his shoes, and two rambunctious kitties chasing each other across them. We are just now thinking we'll have to refinish them in a couple of years. DH is sold on poly. However, I hear there are newer finishes out there that are supposed to be great, I just don't know what they are.

As costly as heart pine is for flooring, you don't want to have to sand it every time the finish looks bad; your investment will be eaten away by the sandpaper. I will put in a plug for Waterlox, a varnish-like finish with tung oil as a component. It can be recoated without sanding, and spot touched-up as needed. The same can't be said for any poly.
Waterlox does require four smelly, sort of slow-drying coats, but it looks super on heart pine.
Casey

We used a product called Rubio Monocoat on our hand-scraped walnut floors. I am pregnant, it was still too cold to keep windows open for good ventilation, and we didn't want to move out for multiple days with a bunch of kids.
The HUGE benefit of Rubio, besides the fact that it looks great, is that it is zero VOC, takes ONE coat, and is only about 24 hours of no traffic. It has a bit of an oily smell, but not too bad. As long as I kept the exhaust fan running, it was hardly noticeable (and I am very sensitive to odors, especially when pregnant).
It can be touched up at any time by sanding any area that needs it. You don't have to refinish the whole floor. It is a fairly matte finish; you can get a satin sheen, though.
A friend of ours who does high end custom floors recommended the product to us.