Antec ISK 300-150 is a mini ITX case that comes with an internal 150 W power supply. Let's see if it is a good choice.
Here is a snippet:
"A while ago we reviewed Antec ISK300-65, which proved to be a nice mini ITX case. This other case, however, comes with an external power supply, with a DC-DC converter module inside the case to convert the 19 V provided by the external power supply into the voltages required by the PC (+12 V, +5 V, +3.3 V, etc). On the new ISK300-150, Antec added an internal 150 W power supply, which allows you to install a more powerful system. Let's see if this new version is as good as the previous version."