You should have a setup delivering at least 120 Watt I think. If it is 150 Watt you would be pleased with the climbing as long as you choose a motor with low kV, and use a large diameter propeller. On such a "small" plane a 10-12" propeller is big.
How do you plan to install the motor in the plane? If the nose is narrow, and you plan to make a firewall to mount the motor behind, an inrunner might suit best. This is because of where the cables come out on different motors. On the outrunners the cables come out close to the front of the motors, and since their housings rotate the cables can be damaged in narrow noses.
Most inrunners have a too high kV to suit pulling up planes at high angles and slow speed. Therefore a geared version would be the perfect choice.
If an outrunner suits in the plane something like AXI 2212/34 is as lightweight as it can be.
To have more punch available, the AXI 2217/20 will be a safe choice. This is for 2-4 LiPo, but since you want to climb fast and then glide I would suggest 2S or 3S LiPo. This is because you can swing more propeller-diameter at lower voltage, and what brings you vertical is a big diameter
The "perfect" motor is (in my opinion) a Cyclon Elite Mini. You can see it on this page.
It is a geared "outrunner", the rear part rotates. It will have to run at close to idle in your plane, but is capable of pulling your next 1,5-kilo model up at an impressive angle. Although; look at the weight: 80 gram! 13 gram more than the largest AXI mentioned above. This is a motor made for one purpose: pull a plane up high at short time.
OK, I don`t have the Mini myself, but soon I will. And why? Because I have tried Elite 10 and Elite 18. I was impressed
2S or 3S LiPo might be your choice, depending on which motor you land at. For the Cyclon I would suggest 2S LiPo. Since I have not had the chance to test one yet I can`t recommend any propeller. But since I said 120-150 Watt for your plane I would have tried to match max 150 Watt.
Remember: even if the motor is able to handle 450 Watt you suit a propeller which suits your needs! If you need 150 Watt then put on a propeller which give you 150 Watt at WOT. In the next, larger plane, add more Volt and a bigge propeller and go flying
A geared inrunner would do the job, but there is one disadvantage: Inrunner with a gearbox in front makes a long installation. Thus you have to move the battery backwards and might have to add led up front.