I don't know about unlocking you better check prices first... About the question "if 50$ worth or not".. I think the K530 is very similar to K610 which makes it similar with W660 too. Now it depends which one has higher price. If the K530 is the more expensive one, I will sugest you to go for the W660 as it is not worth in my honest opinion. If the W660 is more expensive, you should compare features and hardware specifications and see which one of those suits your needs better. :)