So much depends on what you are trying to do with the machine, what is your budget, what available space you have, available electric service, air, vacuum, etc.
A 4'×8' bed and spindle are not going to be inexpensive and will consume considerable space. A CNC that size should probably have an ATC as vacuum hold down which increases the original cost.
I agree with DS above you need to consider what you are trying to do, create a list of desirables, cost, pros and cons of various available CNC machines. I did that before I made my choice and it took me over a year as there are many things to considder. And, don't forget about support as it can be worth more than you think.
My CNC have a working envelope of 24"×48"×5" with a 2.2hp spindle. With the capability of optional extensions for 48"×96"×5" but I have yet not needed that option. I am not going to provide the name of my CNC to cloud your selection.
I'm guessing that if you want that size, this is for a commercial use. Correct?
The shop where I work has a Biesse 4×8 machine, with a vacuum bed. It was just north of $150,000. There are many that are more expensive in this size. Some are less, but not as robust.
this is my idea of a "Multi-Spindle CNC Wood Carving Machine".
it is not for the hobbyist - so the OP must be structuring towards a commercial application.
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