For web development you don't need two GTX 460s. You're better off getting a single 450 or Radeon 6770 and putting more money toward your monitors. You want 1080p monitors, and if you get the Radeon card you could even go eyefinity and have 3 monitors . For web development, screen real estate is alot more useful that monstrous GPU power.
I would have to say that the list of components looks a little bit odd for a workstation for web development.
The motherboard seems a bit excessive, and you have a massive case. Pretty much looks like a gaming PC, with the SLI Graphics and all.
Also depending on how important the photo editing part is, you might consider spending a larger chunk of the money on the monitors.
Dell U2312HM's would work great for you $310 a pop. IPS panels with great viewing angle and color accurcy.
Mobo: Asrock Z68 Extreme 3 $129.99
GPU: Gigabyte Radeon 6950 1GB $239 ( before $20 MIR )
2x Dell U2312HM IPS FullHD diplay $310 each
You get to pretty much $2000.
And if for some reason you need more juice you can get a 2nd 6950.
Just a thought anyway, maybe you do plan on doing some gaming.
I agree with the above. SLI seems overkill. I agree with rvilkman that you'd be better of spending the money on monitors.
However, I don't think a Radeon is the best solution. Since you edit photos you may get benefit from NVidia's CUDA (assuming you use CS5). So, just drop down to a single GTX460. If you want a more powerful GPU you could get a single 560 Ti for ~$230.
Also, the HAF X seems a little excessive. You really don't need a full tower. You could get the COOLER MASTER HAF 922 for $90. Again, you could use the money for better monitors.