You might also like to add the cost of 'plug-ins' to your computer set up.
What it really comes down to is what you want to end up with and what you want to do with it.
A portable all-in-one workstation is just that; portable! A computer aint.
A computer is a lot more expandable than an all-in-one, which is good if you want to keep upgrading your rig to a 'pro' recording outfit, capable of 'pro' results. (But there goes your price comparison!!!)
Don't get me wrong, the modern all-in-one units, Akai or Korg, are capable of astounding results. They may not have the convenience or 'user-friendliness' of a graphical editing environment, but they sure kick some serious butt.
I own a Korg D8, 8 track machine. I bought it on price mainly as I didn't own a computer at the time and didn't want to get into the whole computer set up thing.
But there you go.
Work out what you want and why you want it, and what you want to do with it, and you're half way home!!!
good luck,
Macca