Thank you so much for your thoughts! However, YoussefElZein, I do say I would have to agree with Shmexy, as I would rather buy a lower tier camera now, and some nice lenses, so in a few years, when when I outgrow my camera, I won't have to toss my old lenses for new ones. I'll just get a better camera capable of 4K later, when it becomes necessary.
But I think you make a good point about ditching the kit lenses and getting a good zoom. I'll look into something like that for sure.
And as far as "future proofing" my equipment, what I mean, is I want to make the right choice as far as brand and sensor sizes are concerned. I know I will have to replace equipment over time, that's a given. I just don't want to have to ditch a bunch of it because I'm dissatisfied with Canon, Nikon, Sony, etc. or have to get new lenses after switching to full frame.