Hey Guys, help me decide.....Desktop, Notebook, or Laptop

I am having a hard time deciding what to get.  I use cpu for a) porn b) check email c) watch hd quality movies and streams etc d) some light games like footy manager

They tell me Desktop is upgradeable, more dependable, etc.

Laptops are mobile, but I have a 1200 laptop right now that took a shit.

Netbooks are cute, but I can't see a fucking thing.  They are light and everything. 

Here is my three choices  HPMINI 311, AMD DESKTOP, HP LAPTOP

My budget is 500.  Thanks for the help.

 Absolutely

Thanks for all your responses.  After having a bitter taste in my mouth about a 1200 laptop taking a shit in 24 mos, I decided to go with a slimline hp desktop.  The reasons; Netbooks don't have the graphics card or optical drive, laptop's are great but so damn expensive with hdmi graphics and other goodies I want. 

I got a dual core amd athlon with 2g ram and 512 ati radeon graphics card.  The desktop cost me 400 now I need to find a cheap small laptop since i run most of the stuff on big screen anyway.  Thought this was a good deal.  The slimline is great because im not a gamer and don't need a powersupply and this thing fits anywhere

Any ideas on lcd screens?

"cheap small monitor" I should say

Lipps,

any idea where I can get a cheap lcd screen for a hpdv6000? I tried ebay but I don't like the used stuff on there, they want too much.

How small is small ?

I personally prefer having a desktop as my main computer, way more computing power for way less money with easy ways to upgrade.  I use a $200 Dell netbook if I want to go mobile and it covers my needs fine in the mobile area (web, email, etc.Even streams espn360 and streamtorrent sporting events fine).  I think most people would be better off going the desktop/netbook route.

MWC, I get the impression over the years of doing computers many people use their laptops mainly in their house and dont take them anywhere.  Especially when they buy those monster sized, cheap heavy laptops..