If the insurance claim fails; Yes, do go for the Samsung S4.. Im coming from iPhone (3GS then iphone 4S), and so far (3 months?) I LOVE it.. Personally I like to be able to try different ROMs, not wait 12 months for the new IOS, only to gain a few more icons on the screen (OK, and a few more things).. Samsung is very good releasing new releases of their ROM, some times several releases per week. You will soon get used to the size - personally I find my wifes iPhone 4S too small now, before I thought the S4 looked too big..
Obviously the S4 wont be supported by Samsung after 3 years, something you will get with the iPhone, but then again, not many people keep their phones for this long.