Well i ended up getting the 32GB, though although it cos me £100 more am pretty sure when/if i come to sell the phone then i will retain some of this extra cost over having got the 16GB.
No doubt come xmas their will be a 64gb version but think 32G is prob a sweet spot. With apps getting larger and also the HD footage and increased file size for photos, i can treat my phone like my bedroom....Stuff all over the place and never want to throw anything away :O)