Engineered wood:
There are two distinct camps here; lacquered and oiled. The lacquered versions look superb but if they do get damaged it's not just case of rubbing them down and doing a spot repair - the whole plank has to be done and you will be very hard pushed to match the other planks. they were without doubt the best looking floors but I did't want to have to get in a flap everytime a chair moved etc. These will be the types of floors you were warned away from; they probably didn't bother to tell you there was another type...
oiled on the other hand seemed a lot more appropriate; and cheaper too. there were certain finished that were nicer than their lacquered cousins too. I very nearly bought this!
The upkeep /cleaning is slightly more involved than lacquered or laminate, but you can sand them down every few years and re-finish them (messy!) you can only do this a few times depending on the thickness of the top layer.
The main brand I looked at was V4, but there are swarms of generic engineered floors out there too. V4 are expensive (see advice below about buying laminate though as I eventually got decent prices on V4 - but didn't buy it)
watch out for 'uv-oiled' products by the way; they're generally more akin to lacquered planks. the V4 site has very good information about all of this.