It's a common problem when you ring tech support and say it's cracked on it's own. They don't want to believe you and blame you for dropping it. I had to speak to 3 different people, it took me 32 minutes on the phone to convince them they had a problem with their plastics.
I noticed Orange have dropped the San Diego from their PAYG web page.
I've just had mine replaced for the craking problem, only time will tell if the cracks come back, don't look promising if they pulled it.
Also noticed it had no microphone hole where your mouth goes, so people find it hard to hear you!
In the mean time I bought the Orange Sony XP for £250 (they've now raised the price to £300)
It's really nice, 2x as fast as the San Diego, metal bezel, easy push buttons, Android Jelly Bean, True 720p, Grand Theft Auto is downloadable from the App store, working Micro SD slot, it's got funky lights, and best suprise of all I can plug a PS3 controller into it! :D
5" is more a tablet than a phone, you're gonna need big pockets and big hands.
The Quad Core only seems to benchmark the same 3994 as the Orange San Diego!
If you get stung for import duty it will be more like £180-200.
I've ordered an Orange Sony Xperia SP
Has a metal bezel so hopefully it wont crack up within a month!
2x the Quadrant Benchmark Score of the Orange San Diego (OSD)
A little over twice the price though £250.
For someone on a tighter gaming phone budget, check out the ZTE Grand X V970
Ice Cream Sandwich 1Ghz Arm Dual Core and Nvidia Tegra 2 - £120ish new on ebay.
There is an Intel Version too called Grand X In (I think I'd go with the Arm version though for better game compatibility)
I had a ZTE Blade for 2 years the build quality was sound.
There's also the Jaiyu G2 (£99) and Jaiyu G3 (£156) to consider.
I have no idea on build quality from this manufacturer.
But the specs and benchmarks look good.