Just returned from Reykjavik a few days ago. Horrible weather (love those Arctic winds!) but still a great trip. Definitely a noticible difference in prices both for eating and shopping! Went to the Kringlan shopping centre for the first time and found good bargains, and ate at some great places (highly recommend both Shalimar and Icelandic Fish & Chips; also B5 if you want to splurge a little). Never get bored of the museums and galleries either. I would try to avoid having too much leftover ISK though as it was very difficult to exchange once I got back to the UK!