About 800 watts would be minimum for your goals and about 1200 would probably be right about on the money. You can always go higher.

Figure 20 volt pack and about 60 amps using a 6S lipo pakc for a 1200 watt set-up. Or a 30 volt pack ( 8S ) and 40 amps. Both would work, just a matter of what the motor calls for.

For 10 minutes all out figure an 8 Ah or 8000 mAh pack, asssuming you are running all out all the time. With a little throttle management you could do it with a 6000 mAh pack.

You could also look at A123 cells for a plane of that size. High discharge and fast charge make them a good fit or planes like that.

The combo 46 would be your budget package. The Combo 60 sounds more like what you are looking for.
http://www.maxxprod.com/mpi/mpi-264.html