Help confirm upgrade path for mac pro 3,1

Hi Everyone,

I'm upgrading a Mac Pro 3,1 for my wife who uses it for some light gaming (think portal, civiliation, some indie games like trine) and for iphoto, netflix etc.

I've put in an SSD and have upgraded it to 8 GB of ram. So far so good! I now want to upgrade the video card.

I've read something like a gazillion posts on this forum. After reading most(?) of them, I'm thinking of getting this:

http://www.amazon.com/EVGA-Superclo...e=UTF8&qid=1418242827&sr=1-1&keywords=GTX+570

A few questions:
1) Can I leave my current video card in the mobo now or do I have to pull it out?
2) If I connect my monitor through a dongle that converts the dvi to vga, will the boot screen still show?
3) If I connect my monitor twice (once through the dvi and once through the vga dongle) can I just select which one and if I select VGA the boot still shows?

4) Any difference, betwen the Ti/Ti-SC/Ti-FTW that I should know?

5) Do I need any extra connectors (and if so which)?

6) Is the card enough for my wife to do some late gaming/iphoto touch ups? (I'm assuming netflix, hulu, etc is all pretty trivial).

7) More importantly, is the ugprade worth it -- will the machine actually function as a fairly competent box for the next two years or so?

Sorry for all the questions but I'm almost done so I figured I'd ask all of them at once rather than piece by piece...

Thanks for your help!!

Awesome -- thanks for this!

One last thing that just hit me. So any video card with up two two 6-pin power plugs would work (and not fry the psu/motherboard)?

So would something like this work:

http://www.newegg.com/Product/Product.aspx?Item=N82E16814105029&cm_re=7870-_-14-105-029-_-Product


Thanks!