Have you tried Napoleon? I heard its great. I own it, but I haven't had an opportunity to play it, because if its good it will be a time sink which I am trying to avoid right now.
It's not bad. With mods it's pretty solid, even. Its main problem is its much smaller scale and less playable nations (although mods let you play as all nations, so no problem there) and the fact that it's standalone without imrpoving Empire caused some (understandable) butthurt. The engine is much improved from Empire, battles are much smoother (square formation works a lot better for example), it's more atmospheric than Empire, it's got a bit better AI than Empire, it's basically what Empire should've been from the start - only that it has a rather small map.
http://www.twcenter.net/forums/forumdisplay.php?f=1432
Do try some of these mods to check out which plays best for you. They're all major improvements on vanilla. I'm currently on DarthMod with Austria, and it's even slightly challenging (I even lost a battle with almost equal forces once or twice, and lost provinces to the AI which even threatened my capital more than once).