I also like the Antec SonataII a lot, mainly for it's looks (very elegant, classy).
The PSUs in there are good. They are Antec's entry level PSU, and are not really Antec's best PSUs. They are much better than a no-name. Mine has actually failed on me, and I have replaced it with an Antec Neo HE 550W.
The air duct cooling that is mentioned above I also am using, but I have added a dust filter to it. The case has a dust filter on the front intake, but it doesn't have one on the air duct that blows air directly on your CPU (arguably the most important place to have a dust filter).
This is not the best case in the world for any heavy overclockers out there. The airflow is good, but not for extreme cooling needs. It comes stock with one 12cm fan on the back. It is designed for silence mainly, and not cooling. You can optionally add another 12cm fan to the front, and two smaller fans for the special air duct to blow air on the CPU and graphics card, but then you are going up in the decibles which kind of goes against the purpose of the case in the first place
That said, I have an overclocked Athlon64 3700+ cpu at 2.75Ghz on stock cooling in this case (but I have added the second 12cm fan (very quiet one) and a smaller fan to blow air on the CPU (using the duct) and my temps are 40c at full load.
Other than that, I absolutely LOVE this case. I have a black monitor, black keyboard/mouse, black speakers all sitting on my desk with the cool blue lights on the case, monitor and speakers. Very nice looking.