[ubuntu] Running Dragon naturally speaking on virtual windows

Hello,
I have made a complete shift to Ubuntu. I am planning to buy a laptop in near future. Here is my requirement:

What kind of laptop should I buy to run Dragon naturally speaking(DNS) on Windows hosted as guest OS on Ubuntu(host OS)?

I am looking for the minimum specs to have this run smoothly.

Can I run a 32 bit installation of windows (7 or 8) on a 64 bit Ubuntu? DNS needs lesser specs for running on 32 bit windows.

One more thing: Please comment on hard disk, ram and processor requirements.

Here are minimum system requirements as listed on their website:

Minimum System Requirements:

• CPU: 2.2 GHz Intel® dual core or equivalent AMD processor
• 
  
  • Note: SSE2 instruction set required.
  
  
• Processor Cache: 512 KB
• Memory (RAM):
• 
  
  • 32-bit: 2 GB for Windows 7, 8, and 8.1.
  • 64-bit: 4GB for Window 7, 8, 8.1, Windows Server 2008 R2 and Windows Server 2012.
  
  
• Free hard disk space: 4GB
• Supported Operating Systems:
• 
  
  • Windows 8 and 8.1 (32-bit and 64-bit Editions)
  • Windows 7 Service Pack 1 (32-bit and 64-bit Editions)
  • Windows Server 2008 R2 Service Pack 1 or higher (64-bit only Edition)
  • Windows Server 2012
  
  
• DVD-ROM drive (required for installation).
• Microsoft Internet Explorer 9, 10 or 11 (free download available at www.microsoft.com) or the current version of Google Chrome of Mozilla Firefox for Online Help.
• Nuance-approved microphone (included, except for upgrades). Go to http://support.nuance.com/compatibility for more information.
• Sound card capable of supporting 22 kHz 16-bit recording.
• For details on Bluetooth microphones, Tablet PCs and other hardware, please go to http://support.nuance.com/compatibility/.
• An internet connection is required for activation.

regards,
Ravi