@Ron12:
Was in the same position as you, and I went for mac mini as spec'ed by yourself, except that I didn't upgrade the HDD. Did a post-purchase HDD swop with 2x 750 Gig 7200rpm, one with OWC data double kit. 2nd HDD for all the samples and virtual instruments.
Got it for about a month and it has been running well. I run both Logic 9 and ProTools 10.3.
Good luck!