I've no doubt this desktop computer with a 19" monitor is easier for me to use, but occasionally, I'd like something portable.
Then I'd say, if you want a laptop, get it, but don't throw away your desktop and keep it up to date, along with the laptop.
You can set your email, as I recall you are using windows live, so it will remain on the sender. That way you can get it on both machines. Just remember to clear it on your sender site periodically if they have a limit.
I would suggest you get a back lighted keyboard on any laptop and get a larger screen if you don't mind a little extra weight.
That will also give you a full keyboard, like your used too, in most cases, instead of having to push a bunch of keys in combination to do prime functions.
I have a Dell Studio Laptop with a 17" screen and don't mind the weight or size. I have carried it to the library and to a number of peoples homes to copy genealogy data with no problems.
In windows 7 you can set up your desktop and laptop in a "homegroup" so you can look at or copy information from one computer to the other over your wifi router.
Just be careful if you have any sensitive information on your laptop if you use a WIFI in a public place. You can lock it with passwords but there is always some guru out there that can get into your information.
I use the laptop a lot in the evenings, as I am now, sitting in a soft chair with the TV going.
That way I can be entertained by "TBN" and "O'Reilly" at the same time, while hopefully staying awake enough to not drop the dang laptop on the floor
Ron