Should I sell my laptop?

Well I have a 17 inch Dell Inspiron 9300 that just sits on my desk 24/7. Here are the specs:

• 1920 x 1200 17" screen.
• Pentium M 745 running at 2.4 Ghz (pinmod).
• 6800 GeForce Go Video Card w/ 256 Mb dedicated ram.
  
• 2 Gb Kinston Ram.
• 60 Gb 7200 rpm Hitachi HDD.
• Creative Audigy 2 ZS Notebook sound card.

To me, there is no reason to be confined to a laptops form factor if it is just going to be sitting on my desk 24/7. So to solve this dilemma, I thought I could sell this laptop and use the money I receive to pay for a new custom desktop computer. Here are some specs I was looking at on newegg.com.


I am expecting to get $800 at best for my laptop, but I definitely think this is an awesome trade-up. Let me know what you think in the comments if you wish.