Re: Looking for cheapest reliable motor.
Your asking for too much for too little.
You will not get 35mph out of the box for a stock ebay motor.
You'll need a really high geared sprocket (like 26t or something like that)
and possibly some engine mods to reach that speed.
You have a 29er so that helps, but with a 26t sprock or something around there, good luck getting started, you will have to pedal a good amount before you drop that clutch.
I would aim for around 30mph. For reliability, there are a good amount of mods on here to help.
Better studs, right kind of oil, breaking it in correctly, porting, etc.