EPIC4G: Sprint Update removed 'su' hack, also removed boot splash...

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Is there a better rom to use than sprint's stock rom on epic 4g? cuz like, this morning at starbucks i get a popup saying 'system update available'. i tap install, the phone reboots, then i get a linux framebuffer console with a progress meter and it updates the phone's software.. then i get a blank screen - all four panel buttons are lit.. I had to take the battery out of the phone.. Now when I boot the phone there is no sprint cartoon splash.. my root 'su' was gone, i re-rooted the phone OK.. should i worry about this? the animation is gone. it was annoying anyways, id like to put my own custom animation if possible.

now i rebooted, and su still doesnt work, although it did prior to rebooting the phone. sprint is trying to lock me out?
is there a better 'rom' i should use?