I do the can can...

Biggest investment is the can sealer. I had the Cannular with the manual lever. Yeah, no. Too much "human error" for me. Sold it to someone here and bought the 'pro' version which is a button to get it to seal. Better pedestal design as well. Not cheap, but "buy once, cry once". Wish I had bought it from the start (would have spent less total). If you're looking at it, just get the pro version and don't worry.
MoreBeer has the cans in two sizes. The canning machine works with standard 202 lid sizes. So you can get cans from any source that sells those.
Also went with the Tapcooler counter pressure filler setup for cans. Got the base "upgrade" which was 'meh' at best. Ended up making my own larger base (wider and thicker) with a bottom drain instead of off the back. Works pissah now. It wasn't much of an issue for me to make since I have a milling machine.
I have the entire can filling and sealing gear on a single rolling wire mesh cart. Makes it easy to move into position (in front of my conical fermenters) and use. When done, pretty easy to clean up and then roll it back to where it rests. Advantage of the wire mesh cart is the base for the Tapcooler can mount through the mesh so it's easy to use. With my new base, I simply put a container under it to catch the overflow (foam) and such.
Oh, and DO get the splash shield for the filler. Only issue I had was the shield doesn't work great for the taller (500ML) cans. I added another piece of plexiglass on the front to extend that down far enough. I also made a splash shield for the rest of the sealer to keep it from spraying all over the place. Simple corrugated plastic was used for that. Easy to clean when done.
Something else I saw on a couple of the videos when I was looking at filling options and such. Have a large bucket/tote of water next to the can sealer. After you fill and seal the can, drop it in there. Depending on how much it floats you'll know if you got the fill right, light, or heavy. I have better results when filling from conical (already chilled and carbonated) than from keg that was in the keezer before.