I'm very happy with my current phone the Moto DX, but if there were one thing that would compel me to buy a new one it would be a larger screen. The issue is I don't want a much larger phone overall, because the DX is on the upper limit of pocketability and something like the Dell Streak is a behemoth with an unnecessarily thick bezel.
Here's a same size DX with a roughly 4.7inch screen I mocked up.
And just for comparison Dell Streak 5in, Samsung Infuse 4.5, DroidX 4.3
Would you want a phone with a screen larger than 4.3 if it didn't mean having that much larger of a phone?