Thanks Warlando, we finally booked a flight to Ivalo again - twice more expensive with poorer connections than our first trip there

- but I'm already thinking about our later trips to Scandinavia !
We went to Oslo again late august last year than drove around a 150kms perimeter during a few days and liked it *very* much. I checked a bit on the internet and the activities offered in Northern Norway seem less family oriented than in Finnish lapland - but it's also quite a bit warmer on the norwegian coast. Bergen would be too far south to see the northern light but i definitely have to visit this city.
Might head there next summer as well as to a couple more places in Scandinavia for a longer journey.