I'm new to Apple computers. I decided to make the switch, and went to the Apple Store online to build a new iMac. When I was done, the computer I wanted was about $3,500.00. So why wouldn't everyone want to purchase an older Mac Pro with 8 or 12 cores, and maxed out otherwise for about $1,300ish? I intend to use it for online college and personal use. Will this work Awesome, OK, or not at all? Are all 12 cores able to be utilized, or does the software have to be specifically written to utilize 12 cores? It seems to me that these older machines might still be ridiculously fast, and at a much lower price than brand new. Please advise. Thank you so much for your advice.