Opinions on the build for my new computer?

There is no way that 450W power supply can work with that system get at least 700, preferably 750+ for future upgrades

Pretty good but I'd go with an i5 4670k instead so you can overclock down the line. And switch to a Z87 chipset motherboard. It won't add that much to the cost.

Also, not a fan of that CM PSU. Especially at that price. Ignore the guy who said you need 700W but you can get a better quality one at that price.

Otherwise looks fine

Sorry, but 700W is ott.
Why 2 monitors?
Edit: Have a look at this: http://www.bit-tech.net/hardware/psus/2014/06/20/550w-650w-psu-roundup/1
I agree with AloXX concerning the CPU. Get a K-model so you can oc it.

I would go with a i5-4670k instead of that i5-4690 that you currently have. This way, you won't have to worry about needing to get a new CPU for a long time.

Apart from that, you may want to get a 500W or higher PSU in case you decide to ever upgrade the build.

I would get a better motherboard.

you can get pretty awesome monitors for really cheap. dunno why you would spend 300$ for monitors.

So you want 2 monitors and then write you can't afford a better motherboard? :D
Edit: Why no proper CPU cooler? Do you want to use the stock one?

A 4670K should be something you should be getting. Also, what do you need two monitors for? I would also upgrade the PSU a little higher just to be future proof (trust me, replacing the PSU is a lot of hassle).