Even if you need a small machine many times will come a job that you will need something big. 6090 machine is minimum do all machine for hobby and making some money. You could do almost all on that machine. So in your case that would be it. I dont know for that cash you have if sb could build that to you. Maybe 5000. But all-arounder for any business is a 1200x1200

That Exel CNC is a big No for me with only 100mm Z axis . is it me only but a machine with less than 150mm travel is absolute shite in my eyes. Yes, i had one , my first machine was like that. It made me money but...

Example: One of the best bits i use are the CMT insert 90 degrees V cutter and the 12mm cutter. Typical sign making bits. So the 12mm bit is 50mm long out of spindle. material if 30mm wood or whatever, thats 80 mm already. Sacrificial layer 10mm. 90mm. we need 30 for the cut and 10 for clearance. Thats 130mm . How do you do that on a 100mm Z travel. And what if i wanted a vise to hold the material, or a vacuum table????

As i said- a big NO