That would depend quite a bit on your budget and what you plan to use it for. Best bang for buck if you only want to engrave images onto small-ish objects is quite different than if you want something that will cut relatively quickly.
For the “generic” answer, a K50 with a Ruida controller is about $1500 delivered, qualifies as “table top” and would do good work both engraving and cutting: https://www.toolots.com/50w-co2-laser-engraver-and-cutter-12-8-usb-port-fda-certified.html
For scale:
A K40 with a Cohesion3D LaserBoard added in would be about $600, and the quality of results would be similar. Slightly less cutting power, no built-in air assist, a little more effort to tune, not quite as “out of the box” and no movable Z axis, but less than half the price, even with a few other upgrades.