"Getting the bits together" is really not a big issue. Spend 20 minutes at Home Depot, another 20 minutes putting it together, and you're done. I think I have some 3/4" to 5/8" fittings, but you can get your own if you'd like. Check Grainger.com. 2" pipe, caps, and a couple fittings is not a big deal, and costs all of $30-40. If you're really not into DIY, the ISTA will work.
Atomizers are far too termperamental for my taste.