There are just not many good cnc machines out there in the sub 15k range.
I would look for Kerk anti-backlash screws or ground ball screws with double nuts anything with more than .001 in backlash will cause problems with inlays. You might ask Mc2 he might have more insight into what is available I built me own last year after using a K2 for a few years. also a welded top might not be best as the heat from welding can make steel warp.