Mostly wot iwrbf / Peter said, I'd just like to add two points
1) Turbo is as important as de-ice, and oxygen (although portable is fine). This will give you the ability to fly above the weather most times of the year. Outside convective cloud, the icing layers are not very thick, so the icing equipment is useful to penetrate it (rather than loiter in it). Much better to do that at 1000-1500 FPM than at 300 FPM, reduced by ice to 100 and then negative...
2) TKS equipment is anti-ice. Advantage: better performance than with boots, where you get bits of ice clinging to bits of the wings. Disadvantage: should be running before you enter icing conditions, and if completely dry it should be ground-run until all panels drip before you take off... the fluid is expensive. I paid more for TKS fluid used outside icing than I needed for actual icing... and down-route it might be hard to get any, so carry plenty!
NB - The main differences between the SR22 FIKI and non-FIKI system are a second fluid pump and a third "ultra-high-flow" mode that was required by the FAA for effectiveness in more moderate icing if the system was not primed properly, so redundancy is actually ok. (I am deliberatly not using severe - severe icing will bring down ANY aircraft)