DrOblivious: Licurg: Sacrifice is not like other RTS games. It's 3rd person,you control your wizard as you'd control a character in an action game, and the control on your units is only as in-depth as you want it to be. It also has almost 0 resource gathering, if that helps.
Never played Arcanum, but heard it's good from many people, so I don't think you'll be disappointed. But I doubt it's as good as Sacrifice. Take a leap of faith my friend, trust me, buy Sacrifice and you won't regret it.
DrOblivious: alright, now I'm interested. This sounds sort of like battalion wars for the gamecube, is it anything like that, because I LOVE batalion wars.
Never owned a gamecube, so can't help you with that. But I can tell you this:
Sacrifice is perfect in almost every aspect:
-The best voice-acting of any game outside the Legacy of Kain series
-Best music in any game ever.
-Unique and perfectly balanced gameplay that doesn't exist in any other PC game I ever played(and I played quite a lot)
-High re-playability, with 5 different campaigns, each with it's own ending.
-Beautiful artistic design
-Touching storyline
And I'm gonna stop there and let you discover the rest for yourself :D