i don't own an epoch so i'll leave the comparisons to others. although i've heard a +1 cell epoch is fun to drive! you are limited in body selection...
the mini z scene is very much alive! go to tiny's sister site
www.minizracer.com and you'll see all the activity!
a stock mini z with 700mah nimh's will run for 50-70 min's, depends on conditions...how you drive. there are numerous hop ups for the mini z....too many to mention. if you do get a mini z. be aware a new chassis/design will be available this summer...you might want to wait for the new one or get an existing one for (what will surely be) cheaper than they are now.