I have to agree with ap72 a lot of this info is hype. Take a look at this test Break-In Oil
Please understand I'm not saying this test is gospel but I would think film strength of the oil would be a top choice when choosing an oil with a flat tappet cam. In this case if your looking for a value oil you can get the #9 rated 5W30 Chevron Supreme conventional, API SN = 100,011 psi film strength. I pay $12.99 for 5qt jugs at Bi-Mart. It beats most synthetics on the market.
Another interesting thing the film strength tests show is oil weight does not necessarily = film strength. I have also herd over at Bobstheoilguy that some weights in the same line of oil may be better than others. For example the 0w-20 may be the newest formula and may actual outperform the heavier weights.