I still need to try Agricola.
I still need to try Agricola.
Prosperity also brings an entirely new way to win to the game: through tokens, which you can accumulate quickly by buying things like Duchies for cheap and then trashing them as quickly as possible.
We have a few house rules that allow us to "tune" each game before it starts, and we've had a huge variety of games as a result: everything from 15-minute time trials like you describe, to Dominion "golf" (most negative points wins!), to hour-long slug fests that leave me wanting to flip the table in aggravation.
(edit: I've done my fair share of aggravating others though too -- ended up abusing a village-king's court-torturer combo badly enough at one game night that torturer was pretty much forever after banned; the same night a different table got me back with a consistent militia-masquerade 1-2 punch that left me flopping around in the game like a fish out of water. Anyway, there are all kinds of ways to play this game, so if you're finding it repetitive, you're probably missing something!)
Our house rule is we can't play with more than 1 stack of "+2 action" cards, because most of us will just buy those and combo them with "+ draw" cards, which give us "+ action" cards, eventually allowing the entire deck to be drawn, and ~30 victory points gained each turn.
For an interesting variation on this idea, try Quarriors -- it's like Dominion but with dice, with some faces being treasure/currency, and other faces being the creature/attack spell.
http://www.sirlin.net/blog/2010/11/28/puzzle-strike-and-domi...
His other game Flash duel is also really good. It tries to capture a fighting game (a la street fighter II) with the board game. It succeds in the zoning part imho.