After Market Valve Springs

So, I am getting these GT40P heads, and I plan on upgrading the valve springs. The heads have 120xK miles right now. I think springs are pretty much a need. After I decide my springs, I am going to contact Comp Cams and have a custom made cam made with the build I currently have, so I can take advantage of what I want and am looking for.

My question is, does anyone have any experience with the TFS-2500100 set? Anyone recommend anything else? A local machine shop will be installing all of this, even though it stats there is no machining required, which I don't believe.

Any advice will help! Thanks!