I would at least wait until after the Samsung event on the 11th where they are supposed to announce the Nexus Prime. it was just leaked that it has a 4.6" 1280x720 Super Amoled display with ~320ppi and no physical buttons so it shouldn't be larger than a 4.3" phone or so.
Awesome timing on Samsungs part with the leak though, perhaps a bit of payback for all of the lawsuits.
Lol @ Leak
Most intentional leak ever i think. Looks nice, I would like it. If i was super rich i would get one alongside my iphone. But i am not, and i'm not willing to abandon what is probably well in excess of £200 of apps and movie purchases, besides i do actually still like the 4S - just not any more so than the S2/ Nexus Prime.