If you're interested in RTR, be sure to get the Platinum Edition (or RTRPE) wich is built on the 1.5 version on the game. You'll have to browse a bit around their forum to find it. I find that the step from 1.2 to 1.5 was a huge improvement for the mod.

Some points about RTR: don't expect to be fighting the Roman civil wars, there is only one unified Roman faction you can play. Cavalry has been rebalanced, they're more expensive now and they've got weaker defense so they can't charge infantry head on anymore and win, but if used with tactical sense they can be devastating. Personally I like having to use them more carefully more than then being able to charge them straight into a phalanx and still win. Battles are a little slower, overall units can be counted on to last longer than they did in the original RTW.

I highly recommend it

EB is good but it's still in the beta stage. It focuses a lot more on detailed historical realismthen RTR, so if you're interested give it a try. Their forum is on this site, check the hosted mods section.