I have a dell inspiron 3000 model and was wondering if i could use the Radeon 6450 with its 300w battery supply to run low maintenance games? I currently have a intel graphics card which does not treat me as well as i would like a GPU to. (which is not expected of an intel card)
Ok never mind then, it is 300w. Google just went to the slim instead of the mid tower since 3000 is not the real number. The mid tower is 3847. At the top of your budget is the 750 which could play higher end modern games on med-high. I don't think you'd need that much so could go with a 730 or r7 240. http://www.amazon.com/dp/B00L5GZOOK
It will natively support 3 monitors and up to 4! If you only plan to run 2 monitors, I suggest using "digital" source like below:
Option 1 - DVI (monitor 1) Display Port (monitor 2) <<<because the natively support same resolution
Option 2 - DVI (monitor 1) HDMI (monitor 2) <<< stays at high res and all digital
Option 3 - DVI (monitor 1) VGA (monitor 2) <<<still perfectly fine, just mixing digital and analog .