I just got back from this trip:
Needless to say it was pretty amazing. Unfortunately the Icelandic Kroner has been going absolutely crazy and the price has gone up significantly for 2018.
But if you have the means I would recommend this trip, Expedition Engineering, and the Arktika (the boat they charter) highly.
Siggi is the owner/skipper of the Arktika and he is awesome. More about him here:
If you have any questions that I can answer feel free to PM me.