yes a vs450 will run an i3 and either a 750ti or the 950. the 950 is a much better gpu and worth the extra cost. and the vs450 has the 6 pin power connector needed for the card.
Yep just make sure your psu has a spare 6 pin cable as you will need to connect to it to your graphics card some gtx 750 ti's don't need a 6 pin but others and the 950 do.
yes a vs450 will run an i3 and either a 750ti or the 950. the 950 is a much better gpu and worth the extra cost. and the vs450 has the 6 pin power connector needed for the card.