*Personally* I think replacing the cap and rotor is completely and utterly pointless if they pass a visual inspection.
If they are cracked, toss them. If the rotor is worn, replace it. But if the terminals are clean (inside and out for the cap) or just have some corrosion, clean them off and re-install. There is nothing more than what you see to either one of them, and absolutely no reason to replace them "just because". If they pass a visual inspection, there is nothing wrong with them...unlike plugs and wires, which are constructed in a way that does not allow you to inspect them thoroughly visually. They can look fine and not work correctly.
On the ignition side, your distributor wiring, plugs, plug wires, and distributor advance mechanisms are the common failure/replace points. If any of those are bad, you will have a poor running engine, and they are either items that should be replaced regularly, or are ones that consistently fail over time.
As to the summit complete set, IF you have to replace everything it comes with, and they are high quality, probably not a bad deal. But if your other components are good, why not spend $100 on some great plug wires instead of $100 on lesser quality components?