The Star Citizen 'hierarchy' of hangars (from lowest to highest - Self-Land, Aeroview, Revel & York and VFG Industrial) basically means that you have access to the highest tier of hangar that is in either your package or your ship - although the package will still say Aeroview, the VFG Industrial Hangar 'attached' to the Sabre is the hangar you'll have.
You also get all the hangars below that - so with the VFG hangar you can switch between all four hangars in the 'My Hangar' section of your account.
It's the iMac's internal hardware not having support for Windows. The iMac had to use a custom connector to use 5K. This monitor uses two DisplayPort cables to use 5K because (as Linus says) only using one limits you to 4K.