I’m not the guy to ask about graphics cards -I honestly have a hard time telling them apart sometimes- but that cpu looks good. Are you going to overclock it? and have you considered cooling?
What about a motherboard? RAM?
Regarding the SSD, how much stuff is really “tied to performance”? If you find a 250GB drive at a good price point, sure, go for it; but I think you could do just fine with a 128.
Dual 24″ would be awesome.
Why not go triple?
I’ve tried three, and I didn’t like it. Personal preference, though. Admittedly, I might feel differently if I had a bigger desk.