CNC Webcam for work positioning

Could anyone recommend a good but affordable webcam for work positioning. I am currently using two. An ultra cheap little square unit and an endoscope type. They both perform OK but the square one is difficult to mount accurately and the tubular endoscope mounts easily but has no focus and is fixed obviously for close inspection. So seeking something in between. i.e. an illuminated tubular body with focus and depth of field. If you have found and used one that does not break the bank. I would be most obliged for your recommendation.