Unix & X-Windows on 386SX

[SEX MANIAC IN TRAINING]

I am interested in starting to use Unix/Xenix or a derivitive on my 386 PC.
I would also need to maintain the ability to run MS-DOS based Programs.
(Usix VP/ix or something similar?)  

I would also like to use the X-Windows system on this system (I currently have
the mouse and graphics needed.)

Can anybody advise on the following:  1) The amount of Disk Space for the OS?
2) The availability of Unix/Xenix etc from companies (ie who makes reliable
versions.) 3) Where can I get X-Windows systems and cost involved.  Hardware
required?

Thanks


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