Voylinslife

He's a friend after all so I would just ask 350 or 375  
500 is more the price you would ask to a stranger or to a friend which you don't like that much

almost everything is used parts, and you are forgetting my cpu's are from 2010, so.. quite old. 
 
because i HATE Windows 10. in an ideal world i wouldn't use Windows at all, but i play a lot of games that won't run on Linux so.. on my laptop which only has intel graphics anyway i don't need Windows, so i don't use it. 

The way application installs on Windows work is probably different to what you think. They aren't like OSX packages which are all self-contained - even if you install Premiere to your hard disk, many files will still be installed to your primary partition (your Windows partition). This is to ensure files needed for maintaining, removing, updating or otherwise changing the software are guaranteed to be available to the OS that's running, along with things like temporary files created when the program is in use.
 
Just installing Premiere, or any large program or suite of software (anywhere), will add a not-inconsequential amount of data to your Windows partition. You need to keep that in mind when considering your partition layout.

When installing ubuntu, just select the 40Gb partition, and use '/' as the mount point. This will mean that your /home folder will be placed directly under '/' as opposed to a seperate location. This sounds like a good option.