I have super narrow ankles, wide toes, and flat feet like ou and without a question Nitro boots are the way to go. The Nitro Selects
come with a removable plastic insert that makes it pretty stiff for freeriding, but you can remove for park. The link I listed is from Backcountry.com, which will ship to your for free to US/Canada and will accept the returned boot EVEN if you ride it and decide you don't like it for a FULL REFUND.
I've owned the 32 Tm-Two and ridden the Prime. 32boots are just super soft in general... the Tm-Two is like a 5 out of 10 and went to mush after 30 days. The Prime was only marginally better. Salomons are better, but the heel is still a little wide (I get heel lift). Nitro is the BEST for narrow heel wide toes (I have flat feet too, but custom footbeds are what fix that problem)
In my search for boots I have tried multiple models of Burton, Ride, K2, DCshoes, Vans, 32, Salomon (F22, F24, Dialogue, Synapse, Malamute, and Nitros boots.