waser was really good too (echoing what jofel said).
from the historical days acci and ronnie were godly (echoing what silver said).
and also echoing what silver said. 7th heaven was the first famous great netgainer.
i think the most consistent netgainers in terms of t10 finishes lately (aka EE days) are highrock, LT (also most consistent in failing his destock), and phx (he had 4 top 10s with LaF in the first 6 ee resets before retiring, that's pretty damn consistent if you ask me), alicia during the early EE days was also a consistent t10 finisher, but she hasn't done much lately (cuz she turned lazy :P) florian seems to be consistently putting up t10 finishes also. osso seems like another guy who's always up there from what i see, as well as lenshark (plus the fact that i'm pretty sure they will both finish t10 again this reset confirms that fact)
bakku came back for 2 resets and placed t10 in both so far (and won last reset) so he's definitely up and coming (as well as having historical t10 finishes from the 90s and early 2000s)
there's only so many resets in EE so far and look at this:
http://alliance.www.earthempires.com/leaderboards?type=3
i'd say any of the multi t10ers are not too shabby.