Fill tank recommendations

UPDATE:

I ended up buying an Tuxing 6.8L tank with the dual gauge valve assy and dedicated fill port. Very nice looking build quality with regards to the tank and valve assy. I also purchased a GX CS4 compressor to fill the 6.8L and top off my 250 and 300bar tanks. Very pleased thus far. Thank you to everyone who contributed to the thread!
You are going to end up with at least one more tank. Always good to have that ready spare full tank. Especially if you are in a hurry.

-- Matt