Regarding the Laptop update-I do not believe it will be possible to achieve what you want, with a processer upgrade and a SSD drive only- even if is possible, the advantage would be minimal.
With the Desktop, as you do not play Video games on your computer (you do not say what operating system you are using), I would suggest upgrading you memory (XP max. 3gb.)
Check your computer specs. for max memory if you are planning (or use) Vista or Win 7.
A decent monitor will add pleasure to whatever you plan to watch on the screen.