I am not SEBI approved Analyst or advisor. Investor/Trader must do his/her own Study and analysis before investing their hard earned money.
Under valued or valued discussion/analysis will definitely distract you from serious fundamental analysis. So, better concentrate on business model, promoters and other fundamentals instead valuation. As you are intending to invest 5 to 10 years, so things becomes very simple. For a quality business and promising Promotors, I am ready to pay in comparison of unknown low value companies. So try to base your decision on fundamentals not on just valuation.
Just for your ready reference, I am attaching few good names, where you can analyse further.
First table, high value stocks.
Happy Investing