This is the base that I have, and I always wanted to try this semi recycler tube:
(the ceator of sticky bricks and them turn this into a bent neck after discovering the original straight neck design as one of the first hydrotubes ever available on DHgate and was the first available with hydro bricks as a result)
However I think people really liked this one, at least when it was available from VXL, I think it was one of the fancier type of exclusive pricier designs:
(tree perc is not so ideal imo and can be more annoying to clean, though the swiss holes would be really nice, I'm also not a fan of the mouthpiece, but sidecar orientation like this would be cool to use... Despite the tree this could probably be a good option for dry use actually and less frequent cleaning)
(^this one is slightly different)
This one looks pretty good too, great perc for more flavor retention, and seems like a good design for outer single uptake klein recycler with incycler drain, although I'm not certain how well it will function in use as I've never seen it?
You could use less water though and not have to worry about the recycler function much at all, just some extra weird pathway, however with enough water it should be able to recycle and work very well for dabbing, and looking at the design I think it could actually work well for herbal vaping recycle too depending on airflow etc)
Remember this was the classic for direct dry use:
This is a good one for modular mouthpiece connection (I don't like the ones with matrix perc so this one has a simpler circ perc I'd prefer) simple minimal water and could be used dry too:
I remember them also having the slitted inline perc to triple honeycomb disc sidecar hydro tube, that was another expensive high-end model from VXL, but I'm not seeing it there now (maybe in the yingmin store) that one would be most smooth with water however so probably not what you want exactly compared to these others
Yeah as long as you are going custom, maybe they can do the logo too lol (nothing wrong with the China foots though if you just need something, I honestly cannot tell if there is any difference with mine, I have one from the hydratree so it could be US made perhaps and the other one I got from their going out of business sale so it is certainly Chinese)
. I had an OEM Helio before that for years & it worked beautifully with ultrasonic cleaners. Anyone know? 
