Upgrades to my late 2009 I7 iMac?

Goodmorning,

Trying to make a decision. Advise would be appreciated.

I have a Late 2009 I7 iMac that I am very satisfied with. It has 8GB memory, 1TB HD and the I7 processor. And it has a DVD/CD internal drive.

I need some more screen space so I want to add a second display. I do not have a thunderbolt only a mini port connector. What model cinema display do I need? A1316

I would like to add a SSD. My question is will it make it run hotter? It already heats my home office very well all by itself.

The most memory I can find is 16Gbs. I am guessing that is the limit.

I upgraded my Alum Macbook 13" with 8 GB memory and a SSD and it performs wonderfully. So I am thinking about updating my iMac. My other option is to buy a new iMac when they come out with second display. Fusion Drive option with max memory and processor. I will also need a external BD/DVD/CD recorder. I use DVD/CD almost daily.

So any thoughts? Thanks for your time.

Mike