DS X17 Laptop Level 1Desktop Alternative

I've been searching for a new laptop to use as an alternative to my desktop.  After reading various reviews here and on the web I feel confident that DS will be my next laptop purchase.  I'm not a gamer but would like the option of running both an SSD and HDD in the laptop.  My main use will be in our business of developing instructor lead training, web and computer based training.  It will need to run Office Pro 2010 full out, as well as Adobe Captivate, and Oracle's User Productivity Kit.  I will have numerous programs running at the same time as well surfing the web, and streaming Netflx and other movies and/or sprting events.  While Battery life is not crucial, I would like to be able to watch a movie or listen to music if traveling.
I would like to stay in the range of $2000.00 give or take.  Below is the X17 build that I feel would meet my needs.

Chassis Model: Digital Storm x17 Laptop (Model: 8170)
Display: 17.3 Inch (16:9) (Resolution: 1920 x 1080) (Glossy Surface) LED-Backlit Display
Processor: Intel Core i7 2630QM (2.0 GHz Turbo Mode to 2.9Ghz) (Quad Core) (6MB Cache)
Thermal Compound: Premium IC Diamond CPU and GPU Thermal Compound (Reduces Thermal & Laptop Noise)
Memory: 8GB DDR3 1333MHz
Primary Hard Drive: Intel 80GB SSD (320 Series) (SATA 3Gb/s)
Secondary Hard Drive: 500GB 7200RPM (SATA 3Gb/s)
Optical Drive: DVD/CD 8x Multi-Drive (Writes and Reads DVDs, CDs)
Wireless Card: Intel Ultimate-N 6300 Wireless LAN Module
Video Card(s): NVIDIA GeForce GTX 560M 1.5GB
Windows OS: Microsoft Windows 7 Professional (64-Bit Edition)
Warranty Plan: Life-time Expert Customer Care with 5 Year Limited Warranty

The above system prices out at $2039.

How much battery life are other owners of X17's getting?

Is it possible to enable NVIDIA Optimus with this GPU to get better battery life?

Have any current X17 owners had any major issues or problems with?

How do you feel the above system handle my business needs.

Thanks for any and all input.

Al

Thanks for your prompt response Alex.
I have been going back and forth between the xm17 and x 17 and debating with myself the pros and cons of each build.  I like the fact that the x17 has better speakers and a second drive bay while the xm17 has Optimus and could give better battery time if and when I need it. But, based on your estimates of 1.5 hours for the x17 and 2 hours for the xm17, that is not as much of a difference in battery time as i thought it might be between the 2 builds.  While I don't travel that often, it seems I would need a second battery to bring if I was. 

What is the cost of a second battery for each model.

Thanks again

Al