I know you don't want android but I am surprise you had such a bad experience with the samsung s3 ( i think you said it was a s3). They are generally very good. I never experienced any problem with mine unlike the HTC that I had before.
The xperia z is selling like hot cakes right now ( unofficial reports put it at 4.6m in a little over a month) but I am waiting for it to be on the market for a while longer to get proper feedback.
Being pragmatic you already have a working phone, you don't have a vita.
Buy the vita and have both.







