I'm wanting to buy a used Panasonic Tough Book specifically for my Sonar X3. I do a lot of traveling and camping and want something tough enough to handle being thrown around. I can't seem to find the basic computer requirements at the home page.
Here's an example that I'm looking at;
 
https://www.amazon.com/Panasonic-Rugged-Toughbook-Windows-Touchscreen/dp/B00UKEQJYC/ref=sr_1_1?s=pc&ie=UTF8&qid=1470681667&sr=1-1&keywords=panasonic+toughbook
 
Any suggestions?
 

A quick Google search and here you go:
http://forum.cakewalk.com/Minimum-system-requirements-for-X3-m2922734.aspx
 
Oh, I use a CF30 with Sonar 8.5 for live stuff.  Been using it for years!  Works fine.  Though I am only capturing 16 channels digital audio using a Mackie 1640 with fire wire interface.
 
But 8.5's requirements are different:
Before I get too far into this review, I should mention the system requirements for Sonar Producer 8.5.

System Requirements

Minimum

-Operating System: Windows XP SP3, Windows Vista SP2 (32 and 64-bit), or Windows 7 (32 and 64-bit) SONAR does not officially support Windows 95, 98, ME, NT, 2000, XP x64 or pre-release (RTM) versions of Windows7
-Processor Speed: Intel Pentium 4 1.3GHz, AMD Athlon XP 1500+ or higher
-RAM: 512MB
-Graphics: 1024 x 768, 16-bit color
-Hard disk space: 200MB for core program
-MIDI interface: Windows-compatible (Required to connect external MIDI devices)
-Audio interface: Windows-compatible (for audio playback)
-Media drive: DVD-ROM, DVD+/-R, or DVD +/- RW drive (for installation because SONAR is presented on DVD media, so DVD-ROM, DVD+/-R, or DVD+/- RW)
-Webserver access: None

Recommended
-Operating System: Windows XP SP3, Windows Vista SP2 (32 and 64-bit), or Windows 7 (32 and 64-bit) SONAR does not officially support Windows 95, 98, ME, NT, 2000, XP x64 or pre-release (RTM) versions of Windows7
-Processor Speed: Intel Pentium 4 2.8 GHz, AMD Athlon XP 2800+ or higher
-RAM: 1GB or higher
-Graphics: 1280 x 960, 24-bit color or higher
-Hard disk space: 30GB for program and content
-Hard disc type: EIDE / Ultra DMA (7200 RPM) or SATA
-MIDI interface: Windows-compatible (Required to connect external MIDI devices)
-Audio interface: Windows-compatible (for audio playback)
-Media drive: DVD-ROM, DVD+/-R, or DVD +/- RW drive (for installation because SONAR is presented on DVD media, so DVD-ROM, DVD+/-R, or DVD+/- RW)
-Webserver access: Available web server space with FTP access privileges (Cakewalk Publisher requires you to have available web server space with FTP access privileges. An internet connection is required for music uploading. A broadband connection is recommended.)

Note: Registration is required for continued use of product, and may be done by Internet or telephone. Instructions and Cakewalk's privacy policy will be detailed to you during launch of the product.

You could get a rugged laptop case and maybe get something like this:
https://www.amazon.com/Dell-Latitude-E6410-160GB-Notebook/dp/B00B0EUST8/ref=sr_1_86?s=pc&ie=UTF8&qid=1470746786&sr=1-86&keywords=Rugged+Laptop
 
Not sure how well these work with SONAR, but the specs look OK.
 
You would have to be more careful when it is out of the case.