What's slowing my computer down the most?

[DriveJunky_95]

Hi all, new to the forums and also to ideal and optimized computer setups - which has led me here and to my question. I'm looking to upgrade my computer and am in need of some outside input and advice into what piece of hardware might be slowing me down the most. I use Maya, ZBrush, and UDK regularly for creating game art so I need something that can handle rendering at decent speeds (my setup crashes when rendering high-poly scenes/heavy(ier) workloads). I also enjoy high-end gaming i.e. Crysis. My current setup:

3 Monitors running at 1920x1080, 1920x1200 and 1920x1080 // Shooting for 5760x1080 while gaming

AMD Phenom II x6 1100T Black Edition CPU // overclocked at 4GHz -
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103913

Radeon HD 6870 1GB 256-bit GDDR5 - http://www.newegg.com/Product/Product.aspx?Item=N82E16814121418

16GB RAM DDR5

Extra: 700 Watt power supply // WD Black HD

I also want to consider future possibilities i.e. potential Crossfire. I've read that Crossfire is better for higher resolution gaming, but is usually bottlenecked by the CPU. What should I get? An intel i-series CPU? A GPU with more ram? A single/better graphics card? Looking to spend ~$300, with flexibility if the situation seems right. TY in advance!=)

 

[nostall]

Hmmmm. If the PC is playing games just fine on your 3 monitor setup, but having troubles with content creation,then I would suggest the CPU upgrade path.
Sticking with AMD I would recommend an 8350 cpu and a higher end mobo with 990FX chipset
If you go with Intel, then an i7 series as it has hyperthreading, and if you can afford it a 6core cpu, then a higer-end Z87 mobo; but this will be WAAYY over $300.
I was just going to link an ASUS and Gigabyte board, but Newegg must be updating or otherwise having problems 'cause the products page shows the boards at 199.99 but the individual page show 219 and 249.
ASUS Sabertooth 990FXGen3 R2.0 or Gigabyte GA-990FXA-UD7
Here's the processor:
http://www.newegg.com/Product/Product.aspx?Item=N82E16819113284

If it is GAMING power you need, then an upgrade to a 7970 or 7970GHz Radeon card would do the trick; but those run from $600 down to $400.
Don't know if any of the above helps. Your rig looks pretty powerful for everything you are doing. You might actually gain the performance you need for graphics creation by going with 32GB of RAM, but that is just a guess on my part.