Just My 2 cents
As good as I have found better keyboard to be, it's not quite the same as the AOSP one. If you do a xda search for "keyboard aosp" and go to the first link and download the keyboard from that thread you should be good to go. Once you have downloaded the file to your sd card, you can use a program like Astro to install the apk from the .zip. Hope that helps as late as my post is!
You will have to tell sense to use the android keyboard as the new default input. To do that simply open up the keyboard (browser, messaging, whatever) and long press the white space. You will be given the option to switch from there.