I have a 5.5 W blue laser module that attaches to a Sainsmart CNC with an 11.8" x 7.1" working area. Let's say I wanted to upgrade for about $1,000... do I want an Omtech K40 or an Xtool M1 (Ultra?)? We mostly use it to engrave wood, but things that would be nice include: - larger working space (looks like I'm not going to get much bigger - "embossing"/burning designs in leather, maybe cool other materials like slate? - small woodcutting and acrylic cutting projects, probably mostly for cosplay