As for as maintenance goes. How often would I need to be oiling the knife? Part of me thinks I should try taking care of a cheap case cv knife first before I buy the GEC.
Not a bad idea. A Sodbuster or 31048 slimline trapper is nice for a single blade. You can experiment with patinas (like jabbing into an apple for a while, or coating it in mustard or hotsauce), then polish it out and try again.
Honestly though, with a GEC, the problem with rust might come more with the liners or backspring. You can put a protective patina on the blade easily enough, but backspring is carbon steel, and depending on the knife, so could the liners and maybe the bolsters. It's not terribly demeaning to keep them shiny, but it does take some upkeep. Most people don't mind if the backspring or liners darken over time, but it's also easy for them to rust because of sweat and whatnot from your hands. Something like Renaissance Wax might be better for those parts than oil if you want to keep them shiny.
One of my most carried knives is my GEC #47 Hayn' Helper (in NifeBrite). O-1 tool steel blade, carbon steel spring, and mild carbon steel liners. Everything is still mostly shiny, yet I don't oil it, and only occasionally polish the liners/spring. It's not a constant fight to keep things shiny, but nor should you neglect it or do something dumb like run around in the rain with it in your pocket (if do, dry it and oil it asap).
If you get a cheap Case in CV, you can see what the blade will do without constant upkeep. Case uses stainless springs though (these days - older ones were carbon).