I love the quality of HTC phones! But I am always relatively new to the game, usually get a older Android phone so I can get it at cheaper rates. I will probably look at the One S or the next HTC phone as a successor but for now my Sensation does a beautiful job! Much better than my previous Samsung phone, plus I hate the cheap feeling to Samsung's phones compared to HTC's!
But I agree with the OP, bigger than 4.3" is too much for me!
The perfect phone to me is basically something like the Sensation, a removable yet unibody back cover. I like the feeling of aluminum in my hands but the soft grip plastic also feels great! More RAM (maybe 1.5GB
), quad-core monster with 1.4GHz power! Good battery, all running the great Android OS in its natural state or a really nice, trimmed down custom overlay that doesn't gobble up RAM like Scooby-Doo with snacks!