The choice of motors is vast. I have to be honest and say the £90 Kuron 825 motor is great bang for the buck. It's rated at 2050KV (3000 watts) and a similar size to a sensored Castle 1515 2200KV - a £200 motor! The 825 is a hot motor (literally) and will rev insanely.
It has to be run with fans. On stock gearing on my XTR, it's good for 0-60mph - in 3.78 seconds. Due to the fact it gets hot quickly, I wasn't keen to try gearing it up, but nonetheless it was good for 65 mph runs on the 160A Torox ESC.
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The 1515 is a surprisingly torquey motor, given the KV rating, and again runs cooler than the 825 - even without fans. Castle don't state the overall power, but it's more than 3000 watts. It's definitely rapid and took my Sworkz to 60 in 3.68 seconds. It would be much faster if I was able to find greater traction. I'm certain it would be in the 2.90 seconds if I were able to find stickier tyres. No surprise then that it's a popular speed run motor.
I second the Surpass Rocket motor - £50 bargain basement. The 4292 is physically longer than the 825 by about 20mm. It produces more torque and runs much cooler. It's not as fierce as the 825 but produces a wider spread of a rated 4200 watts of power. This motor can be geared up - to a point. On 6S, I geared up to 19/46, but it's actually faster and more useable on 17/46.
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It blasted my rig to a 69mph.

However, for 0-60 times, the 825 was consistently better.
For regular driving, especially off road, or grass, the bargain basement motor felt like it had more available torque and was easier to drive without overheating issues. Bargain!