Help on Choosing Which to Purchase

Hello!

My husband and I are both mac users, and our poor laptops are finally starting to bite the dust after 5 years. Since we can't afford two new laptops, we were thinking about purchasing one desktop to use between the two of us. We were looking at the Mac Mini, but we aren't sure if it would last as long as purchasing a Mac Pro since it has a better processor and can easily be upgraded. So I'm looking for some help on which we should go with based on what we use it for:

-Basic web browsing
-Basic word processing
-Watching movies & listening to music
-I'm a graphic designer, so I frequently use Adobe Creative Suite
-My husband is a gamer, so it needs to play games such as StarCraft 2, Skyrim, Diablo 3, Minecraft etc.
-Multitasking. We're both horrible for working in several programs at once


For the above, which would be better: The Mac Mini or the Mac Pro? I'm afraid the Mac Mini might not be beefy enough, but I think the Mac Pro would be buying more than we need. What do you guys think?

We're stuck in a small space, so it would have to be able to use our current TV as the monitor which could work as I hook up my laptop currently time to time. It would be such a waste to lose the retina display though! But unless macs can now pick up the local news, we'd have to hook it into the TV as we have no other space for it.

I thought the iMacs had integrated vid cards too? Or is it just a better one?