I recently picked up a mint condition Mac Pro (Mid 2010) with the following specs: 8-Core Mac Pro Processors -- Dual Intel Quad-Core Xeon 2.4Ghz Westmere (8 cores) Memory -- 8GB (4x2GB) Graphics -- ATI Radeon HD 5870 1GB Hard Drive -- 1TB 7200RPM SATA Optical Drive -- 18x SuperDrive OS X Lion A couple questions please: 1) Upgrade to Mountain Lion or Mavericks? The Mac Pro is currently running Lion, which I'm fine with, but I'd prefer upgrading OS X to either Mountain Lion or Mavericks? Any concerns I should have with this particular hardware setup? And for what it's worth, I do not want to upgrade to Yosemite or El Capitan because I'm not a fan of the new HiDPI user interface on my Non-Retina external display. 2) Upgrade the Memory and Hard Drive? Upgrading the memory is a no brainer. I was going to buy Crucial memory. The Mac Pro currently has 4 memory slots in use, and 4 available. The 4 in use are 2GB Apple Memory totaling 8GB. If I'm leaning towards 16GB, will mixing the Apple Memory with the Crucial Memory be ok? Or would the general consensus be to just do a full memory upgrade to 32GB of Crucial memory? Anything I should know before choosing which SSD drive I want to install? Crucial says I need an additional bracket to install the SSD drive. Any concerns with TRIM or the SSD controllers on Mountain Lion or Mavericks? Thanks in advance.