I agree with HPloco. A big part of your decision will depend on how your priorities fall between performance, convenience and to a lesser extent cost. For me, and what seems to be a consensus, for performance it's Atty's (dripping, toss the cartridges and don't look back), cartos, and then clearos. But for convenience, it's about exactly the opposite.
I can't speak much about the cost as I'm at the tail end of overspending on finding my favorite flavors, equipment, dabbling in DIY, etc. My impression is that there's not much long term cost difference between the three big options compared to getting caught up in buying mods, tanks, etc.
I travel and am out quite a bit, so convenience rules. Clearos have become my mainstay. The CE4s (visions/stardusts/the ones you have) are, for me, terrific. I've heard there are better performing products (E1, etc), but these were the first I found that I liked and will probably use up the ones I have before trying more. For the kgo, I stick with the lower resistance ones and keep them wet to prevent burning. The CE5 rebuildables are tempting because you can replace the coil and wick for just a couple bucks, but it's not enough savings to mean much. The CE6 is a big step backwards. They have wicking, priming, cracking and leaking issues. By the time I burn through the CE4s I have they'll probably be up to CE10.
There's something to be said for keeping a stash of cartos and attys around. I use attys a lot for sampling flavors, trying them again after they've steeped, DIY, etc. I still have a bunch of cartos left over from before finding clearos. They're great and I use them, but I find that I cant keep track of which are half used, burnt out, just filled, etc. When out and about, Cartos are great for handing out my latest DIY concoction or keeping mooches at bay (a bigger concern as I keep converting friends and coworkers to vaping).
Lastly, I do have a few tanks and find I pretty much use one. It's great for that one special flavor that I know I want around all of the time, but I don't take it outside much.
Enjoy the kgo, not only a great performer, but a sexy combo with the CE4.