Looking at the orginal post, it mentions two screens - so I assume that you already have the second screen. Where am I going with this? Let's see...
Well specced desktop base unit for FS9 will cost £400-500. Connect to that second screen. Now, get a reasonable multi media laptop. Another £500 to £600
Likely total cost of both, is far less than a high end laptop. I know that your circumstnaces may dictate use of the laptop, but you will soon get cheesed off with plugging everything in.
Conan