Hi,
If you know someone that can build these things and is comfortable with motherboards, then I suggest you have him build it for you ... and you can get something with a SSD, 32 GB of Memory, a Radiator for a cooler, a great case, a 1 TB hard drive, W10 64-Pro and a GTX970 ... and all of it for under $1600/$1700 dollars these days. A computer that big, or one that is considered a "gaming computer" will cost much more to be this level, and a MAC is prohibitive and not up-gradable when the time comes to add something or other, if needed.
The bigger difference between "music" and "gaming" machines, is ... I don't know ... I am not sure I have a good music machine, but now I will go and check out some of those, but the ones sold on Musician's Friend, or Guitar Center, are no where what my top 2 machines are, and at this time I mostly use them for writing and some occasional World of Warcraft with my neighbor, on Parkinson's, so it keeps his mind busy and occupied with something more positive than just drugs ... and some medical mana!
Probably in the next month or two, I will start doing some music a bit more daily, and have a chance to check what to use and do on my computers. I do know that the big "sound card" from M-Audio is a waste ... because the technology for sound, on a motherboard, is not designed to be a "mixer", and thus, so many ins and outs, are actually a waste!
Not sure how other machines have this configured or done and will be looking at that soon.
WHATEVER YOU DO, DO NOT GET A "NAME" MACHINE. Their design and updates and this and that are insane, invasive, and will take place at the worst of times. Lastly, if you have one built, make sure you set it up properly. Right after W10 (only use 64bit PRO btw -- nothing else), you must setup your firewall stuff, BEFORE, you even think about a single music anything, and update drivers, Windows and all that first as needed.
This is as much as I know. And I'm not the pro (though I did support for Windows and computers for many years!)