The ISK300-65 actually has a larger PSU inside it; Antec includes a 65W power brick, so it's limited to 65W by default. But you can purchase a larger power brick for it (120W+) and the PSU is capable of supplying more power to your system.
Interesting. Got any links for more info on that?
I forgot the links, but I can guarantee this is true. You can check the internal power converter for the 300-65 and note it handles far more power than 65 watts. I'd say to be on the safe side something like a 90-120w power adapter would work well. The only other thing is making sure the power connector fits correctly.
You can see the device here, it is a MD-135 - http://benchmarkreviews.com/index.p...sk=view&id=320&Itemid=61&limit=1&limitstart=4
This is great news! A cheap power brick that fits should allow me to upgrade to the i7.
Why not just get the ISK300-150 version with the 150W internal PSU?
Just get a quality corsair vx450. Don't skip on the psu