The belt that you would get from a parts store is probably of decent quality. The things you need to watch for are the hard parts like water pumps, idlers, tensioners. These are things that are just as critical as the belt itself, and usually the parts that are of poor or questionable quality from the parts store.
For the vehicles I have had with timing belts I prefer to get the Aisin branded kit through rock auto. These usually come with OEM quality water pumps, tensioners, etc The last Aisin kit I got came with a Mitsuboshi timing belt and the bearings in the tensioner were the same brand as the factory parts, and the Aisin water pump in my case was the factory part.