Typing Speed

Whilst procrastinating I stumbled across an article about how inefficient the QWERTY keyboard was- though I was aware of the existence of keyboards other than QWERTY, I've never actually known the name of one until now. Apparently the world's fastest typing record (English) was set using a Dvorak keyboard...

Now I sort of want to learn it, but I wonder whether I'll become proficient in using both keyboards, or whether I'll forget how to use QWERTY completely... Not sure I want to experiment on myself...

However, I DO have the data... when I casually did this typing test my WPM (words per minute) was 75... then when I tried a bit harder it increased to 89. Using the same site (here, try if you want: http://speedtest.10fastfingers.com/), I COULD consistently test myself and gather more data... but then if I'm 1/2 way in knowing the Dvorak and starting to forget the QWERTY when school starts- that could be a bit of an issue.

Why do you want a faster typing speed? The oh-so-sensible-and-rational voice in my head asks, So much effort. 
To show off, duh.  The other not-so-sensible-and-somewhat-stupid voice in my head replies.

I'm sure people will be impressed by how fast I can type on a computer, and my ability to use more than one keyboard... WHY WOULDN'T THEY BE?