OK, so your looking to burn money and when asked what GPU you have you say its an OLD then thats where to start
your genuinely considering dropping 200 into a motherboard but your GPU is an OLD...
your changing things that will make no difference to your experience.
im going to go out on a limb hear and assume you didn't mention the monitor or KB/mouse because there also an OLD??
When looking to spend just for the sake of it try to make things better. a good BK/mouse make a world of difference
more ram makes none
A new GPU when you game and need one makes a massive difference a new motherboard again none
Monitor is the be all and end all, people buy a £100 27" 1080p and say that good then spend silly money on a tower.
the monitor is the link between you and the PC, its not to be overlooked.
if your looking to burn cash and game at 1080p push to 1440p or high-end 1080