OP specifically said in the title "Average Computer Specs 2015."Even when I tested with a 7200rpm HDD now it was about the same speed, SSD's are so much better when dealing with alot of small files.
The average PC will NOT have an SSD in it. An average PC is some where around $500-$800.
If OP is someone who doesn't want to spend more than $800, then a HDD will do him just fine.