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In theory the Mono camera gives you more resolution as you get the full resolution of the chip for Red Green and Blue, whereas the colour chips use a bayer pattern typically and the resolution is divided up between the colours.
Mono ones also tend to be a little more light sensitive, so shorter subs can be taken, but then again, you have to do one for each channel, so you don't save any time overall.
There is plenty of software available to take the RGB channels and merge them into a single colour image.
The pain is if your seeing is variable, you may get a good red capture but then seeing goes before you can get the Green and the Blue.
A One Shot Colour (OSC) camera is a bit less sensitive, but if you get the shot, you get the shot. You also have less processing time later and don't have to mess with filters and so on.
What are you planning on imaging? Deep sky or planetary?
I'd recommend getting a cheap camera first before spending that sort of dollars, AP is really, really tricky and you can learn all of the processing etc. and get great images to begin with by only spending a few hundred dollars on a 2nd hand camera.
You then can get nearly all of that money back by selling the camera on again when you buy your 'big' camera.
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