Health insurance cost doesn't scale with salary, so % of salary is not a good measure.
I will advise you to pay attention to all aspects of the plan, including the deductible, HSA eligibility, etc. The plan with the highest premium is not always the best. In fact, the plans with the lowest premium are almost always (in my experience) the cheapest overall except in very specific circumstances, like when you know you're going to pay the max out of pocket due to cancer treatments, high-risk pregnancy, etc. I've always received more in HSA funds and saved more in premium than I paid in the deductible and out-of-pocket expenses.