That's a really cool looking plane. I wouldn't compare that plane to my galaxy though, it's about the same size but with a lot less surface and it's three times heavier. I would compare it more to this one that I fly.
http://www.hobbyking.com/hobbyking/...PO_R_C_Plane_w_ESC_and _Brushless_Motor.html
This plane isn't as big but it's not as heavy. My best guess is that the yak you're looking at will fly a little slower but have the same general characteristics.
Here's a video of me flying it in lots of wind and not enough expo.
This is my favorite plane to fly in wind by far. However, it's got too much wing loading and it's too fast and flimsy to be precise enough to be a good indoor plane. I still fly it indoors but the galaxy is much more fun inside.
One thing I notice is that your plane calls for a 1400 motor but it's running on 11.1 instead of 7.4 like mine so it's going to end up about the same. I would bet that a 8x4 would do fine, but when I really have the most fun with mine is with a 9x6. The difference is incredible.
I think that the 2812 is going to be too small. I would find something that will swing at least an 8x4 prop. I think that the 2215 is too heavy, I would go with the 2822 and a 9x4 prop to start but with that motor I think you'll end up around a 9x6. Maybe a 10x5. Bigger props produce more torque roll when you are trying to hover, but they also pull you out of things easier and hover easier if you have the ailerons for it.
The yak isn't going to 3D like a galaxy by any means but I think it's going to be a fantastic outdoor plane and once you learn it I could see flying it indoors. It's going to be much faster, but should be a stable flier. I guess it depends on what you are doing with it.
I hope some of this gibberish helps you.
Oh and I think your 1000 mah batteries will do fine.
