Thanks, that helps. I wasn't sure what the average "reasonable" set of mods were for the 40w, so I was imagining doubling the cost to make it usable. $100 is definitely a reasonable upgrade price, especially considering what I've spent on my XCarve in upgrades.
For now I'll stick with the JTech 3.8w, keeping the 40w as an option for later.
One last question - you mentioned air brush pump, which I assume deals with keeping smoke etc... away, what did you have to do, if anything, special, to vent the machine? Does the included hose work or was that also an upgrade? Thanks!