Unfortunately, a lot of people sell things as combos that aren't necessarily ideal matches. I don't mean to sound like an ad for Hobby City, but the thing I like about them is that they are cheap enough that you can try different combos without going broke. My motor cost $25 and my ESC cost about $40.

Like Ken said, the ESC is rated for the max that can be pulled through it. It does not hurt to oversize it. Take a look at this:

http://www.hobbycity.com/hobbycity/s...eed_Controller

And this motor looks to be equivalent to yours:

http://www.hobbycity.com/hobbycity/s...r_Eq:_AXi_2826

And together they cost less than $70.

As for trying out what you already have, I would. On the bench, with the wing off, and the plane restrained, just slowly increase the throttle while monitoring the temperature of the battery and ESC. If you know someone who has an amp meter, that would be even better. You will get a good feel for the amount of thrust you are going to get out of your setup, your expected flight time, and how hot your equipment is going to get. If your ESC gets too warm, just shut down the throttle.

Good luck.