I did a touring setup recently for the first time, here is what my research found:
1. Buy Daymakers and skins, use your all your existing alpine equipment. Lowest cost approach, best for occasional sidecountry use. Heavy and have to carry daymakers.
2. Buy Frame bindings and skins, use all your existing alpine equipment. Next lowest lowest cost (depends on binding price and remount vs daymaker price) Less heavy than daymakers, don't have to carry daymakers, frame bindings don't tour as well as daymakers with alpine boots. Always have extra weight of frame bindings on skis, rather than removeable weight of daymakers.
3. Buy hybrid bindings, touring boots w/pins, skins, use light alpine skis. Now you will have much better touring performance, especially depending on skis. Weight can vary a lot depending on gear choices. Hybrid bindings would be shifts, cast system, Duke PT's. Downhill performace will vary a lot based on gear choices.
4. Buy tech bindings, touring boots w/pins, skins, and touring skis. Lightest, best touring setup. Usually will give up some downhill performance for much better touring (at least less effort uphill). Can vary performance some based on gear choices.
I went with choice 3 with downhill performance and low weight as my top priorities. I bought shift bindings, Atomic Hawx Ultra XTD boots, Blizzard Zero G 108mm skis, and Black Diamond GlideLight Mix skins. Total cost of $2K. The setup skis very good on piste, except on rough boilerplate snow. It tours really well on the up, fairly light weight and versitile. I use the skis with the shifts with my Alpine boots a lot in spring snow or soft snow. I use the boots to ski race coach in due to rubber soles and walk mode. Not the best for running gates, but the racers do that a lot more than I do, or I switch to my race boots.
I am very happy with my choices. I feel I spent a lot for the use I get out of the setup, but I am working on some backcountry plans for the future. To quote my normal ski buddies "I don't walk uphill, that is why they have ski lifts". Touring is a different crowd of skiers.
The shifts, Marker Duke PT's, and cast have alpine toes and alpine heels. The PT's and cast have removeable toe pieces, the shifts are one piece and the pins flip out of the way. Cast is heaviest and all metal, PT's are next and mostly metal, shifts are lighest and mostly carbon/plastic. I don't want to carry extra parts and wanted light weight without going to a tech binding.
Lot's of choices, just get educated and pick what you like the best. You can't go really wrong unless you try to do long uphills with boots that don't have a walk mode (except with the daymakers which pivot differently and don't require a walk mode boot)