So I've looked at your feedback (which was great!), and restructured my design a bit. I've decided to replace the i7 I had before with a 4th Gen Haswell i7, though I decided to go with the 4770K to give you an extra boost in computing power (though, if you want to stick as close as possible to your pricetag of 2500, your initial CPU works as well). I've decided to stick with your motherboard, as its definitely the best value for its price. As to whether the GTX 780 is as good as the Titan, however, I would have to disagree, as you can see in the following comparison, the Titans is quite clearly better (I did check this information with other sources as well, but GPUBoss displays the information very cleanly, which is good for demonstration purposes).
http://gpuboss.com/gpus/GeForce-GTX-TITAN-vs-GeForce-GTX-780
As to the issue with your monitor, I really see no need for you to get it. It's the second most expensive part of your design, when it really has nothing that warrants that pricetag. If you compare the stats between the computer you chose and the one I chose (I'll provide links below), there really is no difference except the one you choose is 3D enabled and can be mounted on a wall. If that is more important to you than a GTX Titan, an extra TB of storage, and an improved CPU, then go ahead and buy it, but I really don't think it's worth the price.
Your Monitor:
http://www.umart.com.au/newindex28.phtml?id=10&bid=9&sid=136506
My Monitor:
http://pcpartpicker.com/part/asus-monitor-vg248qe
Finally, the updated setups:
Setup 1 - With Windows 7 & i7 4770k - $2601
http://pcpartpicker.com/p/1pfg2
Setup 2 - Without Windows 7 & With i7 4770k - $2511
http://pcpartpicker.com/p/1pf3z
Setup 3 - Without Windows 7 & With i7 4770 - $2480
http://pcpartpicker.com/p/1pfh3
Setup 4 - WIth Windows & With i7 4770 - $2570
http://pcpartpicker.com/p/1pfhw
Glad to be of service