personally to save money I would get a Samsung Galaxy S3, root the son-of-a-bitch and run Cynoganmod on it. It'll run super-smooth without bugs. Otherwise if you're looking for a great Flagship phone i would suggest either the S4, HTC One, Motorola X or the Galaxy Note 3 coming out soon.
The Note 3 will have 2 quad core processors in it.
Great review on Note 3: http://www.youtube.com/watch?v=9NSBB-kFDGQ
Also S3 rooted aka SuperNexus: http://www.youtube.com/watch?v=RQy0NeVnxLo