What is the best Video Card for a Dell Optiplex 760 DT?

Im trying to make the most out of my old Dell Optiplex 760 Desktop, it's not the mini tower just fyi. I am trying to get a very good video card but I'm only finding 1 gigabyte. I found a video card that is 2 gigabyte but I don't believe it would fit.  Could someone who is experienced check the link and see if any of the options for two gigabyte would fit? I don't really know the main dimensions of my own pc. If that doesn't fit what is the best video card for gaming on the Dell Optiplex. I have maxium ram but am looking for the highest quality video card for this PC.

Here is the Video Card that was 2 gig. 

www.newegg.com/.../Product.aspx;cm_re=low_profile_video_card-_-14-487-096-_-Product&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-Skimlinks-_-na-_-na-_-na&AID=12087162&PID=3736271&SID=skim83512X1540009X5224f8ac0f28e38e227d91ff5d15d2d6&utm_medium=affiliates&utm_source=afc-Skimlinks