Purple Shaft vs XE Comp Cam

I have been reading up on the great reviews for the extreme energy comp cams. Currently I have the Purple Shaft .450, .455 lift which runs great. My goal is to get me car into the high 12's after some tuning. But after reading about the XE cams it sounds like you can get away with a more aggresive cam yet remain streetable. Would it be a good idea to switch over such as the XE 284H or the step below....motor will be disassembled anyways so it would be a good time.