What would be the cheapest way to buy this type of laptop?

I want a laptop that has: bluetooth, 17inch display, easy to type keyboard (like this one: http://www.amazon.com/Sony-VGN-FE770G-Laptop-Intel-Processor/dp/B000HM2RM0 )

Could I build my own laptop by buying different parts at newegg? Somebody told me that you can only build your own desktop computers, not laptop.

 

Ok. Is there something like an iPad except that you can actually use it like a computer (run Windows 7 on it?) I like the iPad in that you can type directly on the screen and you can lay the screen on the table which is much more ergonomical than having it upright like a laptop since you can lean your whole torso towards the table in the former but have to bend the neck upwards while leaning the torso in the latter which is ergonomic disaster. Plus you can touch the screen instead using the mouse.

 

i don't like the MBP trackpad (too hard to the touch) and the keyboard (not as easy to type as the VAIO I mentioned).

And I would definitely prefer the MBP screen to the others.