We went up Tromso in November 2015, seen norther lights(was a little cloudy) but I've got a great guide if you do go up there. Their was only about 4 hours of daylight then, so check that out when you're planning. We also went whale watching, seen orca's and humpback whales. Their wasn't much snow then so any husky rides were out the question. No joke, I wanna say in a restaurant their was a salad on the menu that when converted was around £60 haha. but it's not all totally expensive.
We also took a flight up to Svalbard, that was excellent! Pint of beer was cheaper than a pint of milk. At that time of year it was dark all the time, well not totally dark, but it was a little light. We went on a husky ride up the mountains, guides have to take a rifle out with them for protection from polar bears. But husky rides are way harder than you'd think. Put it this way, it was -20 or lower(especially up the mountains) and i was sweating. Will get some of the better pics up tomorrow, been a long day(already in bed, rock and roll!)