Total Novice - Not a Clue

Hi Guys...

I know nothing at all about CNC and before I start finding out more
and lusting after a system, I've got a question...Whats it going to
cost ?

Ok I know thats like 'how long is a bit of string', but I'm after a
very rough idea.

A Mill about Bridgeport size.
cnc on 3-axis
I was a computer programmer before I retired ('C') so I'm ok with
that side.
Have used manual lathes & mills for many years, so I'm ok there.

solder, components, pcbs & I do NOT mix, so it all needs to be 'plug
& play'.

Anyone want to make a guess what sort of money I need to spend ?
I want something that is going to work reliably & not require
constant tinkering. The idea is to use the system, not make it an
ongoing project in its own right, but cost is VERY important.

Thanks for any help

Jerry