As I said, I did buy an R9 270 (not the greatest, but better than the 6770).
I couldn't get the R9 to drive all 3 of my monitors (connections for 2 are vga only, other monitor has both dvi-d and vga). The R9 has dvi-i, dvi-d, hdmi, & dp outputs. I tried various adapters but could never even get 2 to work together, let alone 3.
I mostly play dx9 games across the 3 screens and just wanted a card with more memory. I thought I could just replace the 6770 with the R9, but as I said, I couldn't get it to drive all my monitors. I only bought the card because it was $110 (new) on ebay. I'm not willing to spend more money on new monitors just to have a similar gaming setup as I had before, it's not worth it to me.
So I am trying to find an older 2gb card which is from the same generation as my 6770 to use with my 4250 (I assume I COULD just swap out my 6770 for one of these).
Thanks for replying though.