I'm thinking of purchasing a late 2012 non-retina 15" MBP to use as a desktop station. The 27" iMac is nice but the wait time for them coupled with but some of the issues have me worried. Having a second portable option is a plus here too. I have a few questions that maybe the community can help answer regarding the non-retina version: is the ram user upgradable? is the video card upgradable? is there a way to use a discrete video card? can the non-retina version display at the same resolution as the retina version on an external monitor - can it take advantage of the display resolutions offered by the 27" Thunderbolt display? can the HD be user replaced to a larger ssd? does anyone have experience using Matrox DS1 docking station or have a suggestion for a quality docking station? I would like a Mac desktop, but the Mac Pro doesn't fit in the space I need it to. I feel this might be a solution I can live with if some of these issue can be achieved. I may have some follow-up questions and thanks in advance.