Hi there,
THis really depends on your risk tolerance. There is no perfect formula for diversification and will depend on one own's individual situation. That being said, equal % of the foundational stocks would make for a well diversified portfolio. We made a specific point of adding 1 stock per sector, so that our members had an option in each area. In the end though, it will be up to you.
For example, In Canada many have a higher % of their portfolio in financials because we have very strong financials here in Canada and because they makeup ~35% of the TSX Index. I think mine is around 15% right now, but once again that is within my own comfort level. Only you can really decide that. If you are new to investing in individual stocks and unsure, then take your time. I'd start with equal representation and as you go, you'll start to better understand your risk tolerance. At that point, you can play around with the weightings to see what fits you best.
Mat