Looking for complete or partial upgrade?

[iamdarkyoshi]

I currently have an i5 2500 at 3.8ghz, 16gb ram, two XFX 7950s with 3 syncmaster 204b monitors and a 15 year old awesome case with poor cooling.

 

I just traded an old Mac pro for a cooler master cosmos with a triple AND a double rad installed, and I have 350 bucks of spare cash.

 

Should I upgrade my GPU by getting a new single card and waterblock and put the build in the new case

 

or should I buy water blocks for the existing graphics cards and keep everything else.

 

Also, is it worth upgrading to an i5 3570K and overclocking the balls out of it?

 

What can I get for 350 bucks plus the profit of selling the existing parts?

 

I would also like a good sized ultrawide that would be about the same screen size as two 21in 4x3 monitors.

 

I do some gaming as well as CAD work and 3D rendering/printing.

 

Let me know what you guys think!