I have been using Pearl Mizuno N3's and have 2 pairs that I have been alternating between. 5 weeks before the Marathon and both are worn out .
My recent long runs have revealed that I needed a bit more cushioning (tender feet) and more support (tend to roll the foot more when tired) so have gone for Saucony Phoenix 8's.
Still have time to break them in or buy another pair of Mizuno's if they don't work for me. My shoe cupboard is now nearly as full as Imelda Marcos's!