"When you just use the argument of fuel efficiency, the purchase of a hybrid car is not justified" - Kazuo Okamoto, Head of R&D, Toyota.
Vertigo, to be honest I'm not exactly sure what you want from a car no matter how carefully I read your post!! You want a "55mpg automatic" and "more space than a Golf" or a BMW 1-Series. But you then list "air-con as standard" complain about "lack of driver feedback" and "noise at higher speeds" with "loads of technology to play with" etc etc.
And of course you're "not green" but you can be politically managed into a holding pen by Big Bro Nu Labour with their policy of tax-and-control to make the public jump through their tax hoops as you want to "avoid 120g CO2 tax".
You also say it's "reliable" but in the US alone Toyota have recalled over 1 million! Hope your battery doesn't pack up because it's nearly £4,000 to replace.. a big cost for going green!
You say you "can't hear the stereo above 90mph" ...well I can right up to 155mph in a 335d and I'd pass 2 or 3 petrol stations you'd need to pull your wheezing fridge on wheels into at that speed before I need a refill. The BMW 116i is also 3 times the car your Prius is in terms of driving feel, quality and engineering as James post points out.
BTW the Twin Turbo 4 cylinder petrol and diesel engines from BMW I referred to earlier are out next year I believe. Like the current 3.0ltr Twin Turbo petrol and diesels (models 335i and 335d) the 4cyls are likely to hammer any other engines on the planet for both power and economy.
I know you value space so the Prius may be best for you. Your choice. Here's an article for you which shows the Toyota Camry hybrid takes 8.2 years to breakeven compared to the powerful six-cylinder Camry LE and 5.8 years with the loaded 4cyl Camry XLE. And the Lexus RX 400 hybrid takes a whopping 13.6 years to breakeven compared to the Lexus RX 350.
In short, I'm not surprised Toyota don't make 'straight' versions of the Prius because on pure economic terms (which you puport to only be interested in) you wouldn't buy the hybrid... unless you're green!!
http://www.edmunds.com/advice/fueleconomy/articles/116513/article.html