First suggestion is to look for a second hand competition spec ESC as that will be more than capable in your application, provide you an upgrade path for the future and save you some cash. Many people will have brushed speed controllers in their pitbox that they could be tempted to part with for not very much. Also many people will have knowledge of how to set them up if you need help!
Failing that look at the EZ-run range (try ebay for example) as they offer a cost effective entry to brushless.
As an aside a lot of brushless ESCs can be set-up to run brushed motors so you could always do the upgrade stepwise too.
I must say I am supprised at the failure as I've set several for local people at clubs and they have always been reliable and easy to work with on the kit motor and other mild motors too.
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