I always suggested people start on a reasonable 400-500cc 4 stroke which will generally put them in the 40-50hp range. They're not too much to start off with, people tend to keep them a bit longer than a 250, they're better on the express way and they offer more power in emergency maneuvers.
As long as you don't get anything with "R"s in the name. A 500 CC standard, cruiser, tourer, or dual-sport is fine, but a 500CC sport bike is dangerous for a beginner.
Unless you can reversibly flash the ECU to impose an 8000RPM rev limiter to keep you out of the power until you're ready...but I haven't heard of people doing this.
Triumph has some pretty decent bikes to fulfill that niche.
That triple is also one sweet engine. I wanted to buy one, but I knew that it would get me in too much trouble.
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