I have no doubt suggesting the JTech 7W laser. (I posted a link to my mods for the mounting. Looking to add a laser, questions - #8 by CrookedWoodTex)
As @gdon_2003 implies, anything you put on the Shapeoko is not going to be universally good for major laser cutting projects. It isn’t the right type of laser for that, even though it will cut small part thicknesses in 4 or 8 passes.
So, just plan on using the laser as an engraving tool and to add features to your normal woodworking. I use it to add lettering and accents.
Leave the big laser jobs to a standalone machine designed just for that purpose.