I agree with CaesarVincens, XGM (Extended greek mod)
is very nice mod. It has giant map, Area of Recuritment(A system that after building some barrack you will be able to built some units belongs to the certain area..), and many new units..also keeps the RTW vanilla so you can play original game...
RTR(Rome Total Realism) is very accurrate units and good choices of Area of Recuritment, giant map....
However, his map has lots of cities actually too much, you must fight many sieges... Also, units have two hit points thus battles last longer... and cavalary attack is very weak...and PHASE buldings (buildings must be built to recurit units ) are last long to build and expensive causes the campaigns become slow...
BareBones very good skins, excellent unit distrbution for all factions, giant map with lots of spaces between them so more field battles, but terrible economy (IMO)...
EB (Europa Barbaroum ) is realistic but very complicated game, also its sistem requirements are higher than vanilla.
It works slow on my computer...
Rome Surrectum, very good mod, giant map but lots of space between cities, very realistic animations and excellent skins, but system requirements are higher than RTW vanilla
I vote is for XGM for now...