A good thing to do is identify crappy wonders and resolve never to build them. Here's a list I stick by:
Parthenon (WHOO A NEGLIGIBLE BOOST TO YOUR GP FARM)
Temple of Artemis (Only an inland city can reasonably scrounge up the hammers to get this, and those cities don't get a whole lot from trade route boosters. Plus, bombing a GM in a city with the ToA increases the yield the GM's owner gets, so by building this you neuter your GMs and beef up the ones owned by rivals on your continent)
Great Lighthouse (similar to the temple of artemis, only here hammer rich cities are flat out incapable of making this)
Schwedegon Paya (I think I mongled the spelling of that. Anyway OR and Theocracy are easy to get the old fashioned way, Free Religion is great late but kinda sucks early, and Pacifism sucks no matter how far into the game you are)
Chichen Itza (That extra 25% defense is sure going to last a while against a stack of siege units!)
Angkor Wat (Because eeeeeeveryone wants to run tons of priests and crank out swarms of great prophets in the mid-late game!!!!! no.)
Hagia Sophia (Good wonder on paper, but the AI has a raging boner both for it and the tech required to get it. You won't win a race to this wonder even on a duel map with Montezuma on Settler with gold, gems, pigs, corn, iron and marble in your capital. Don't try to.)
Notre dame (Oh, for christ's sake...)
Versailles (It's like the Forbidden Palace, only like five times as expensive!)
The 3 gorges dam (too late, too expensive. Broken effect on paper, but it's going to last you like 10 turns then someone wins the game.)
Parthenon is very powerful when running a SE. It's not the best for a CE I agree.
ToA is good to have in your gpfarm if possible. I build it if I have marble in my capital, otherwise yeah I usually take a pass.
GLH I build if my first 4 cities will be on the coast and I have a reason to research masonry or sailing early anyways. Most games I take a pass.
SP I don't generally build. I'm not sure it is that great of a wonder.
CI is for the AI and is reasonably powerful in the hands of an AI, especially a protective AI
AW is only good when playing specifically toward mass prophets or when going for a strat like Obsolete's. Saladin is a great leader for getting AW and prophet massing.
HS is amazing and is much easier to nab in BtS if you plan for it. It is a wonder that can REALLY impact your game and to say to always avoid it is foolish imo.
ND is another wonder that is much more 'nabbable' in BtS. It also got BOOSTED, something I rarely see people talking about on these forums. 2 free
in all cities pre-astronomy? That's handy imo.
The problem with versailles is not the cost--which I would gladly pay every game--but rather the tech needed to build it. Unless you're going up the religious path (again, say with Saladin and mass prophets) it's not very useful.
3GD I pretty much always build. True, it comes late, but it is handy.
/ontopic: I think limiting wonders in general is a good idea--unless going for specific strategies.
I usually think like this:
-Am I industrious?
-Do I have stone/marble or other enabling resources?
-Do I have strong production potential/forests to chop?
If I answer no to all three questions, I don't build any wonders
If I answer no to question 1 and 2, I will build 1-2 key wonders
If I answer yes to question 1 only, I will build 1-2 key wonders and then look for production centers later to add later-game wonders
If I answer yes to question 1 and 2, I will make a run on wonders. E.g., I'm industrious and have stone. I'll build stonehenge, GW, Pyr, and HGard. If I have marble I'll build parth, oracle, ToA, and GL. If I have copper, colossus is nice.
If I answer yes to 2 but no to 1, I'll target key wonders. E.g., with stone I will consider pyramids. with marble I'll make a play for oracle, GL.
Basically, what I'm trying to say is that if you're not industrious and you don't have marble/stone, why are you building so many wonders?
Conversely, if you are industrious and do have marble/stone, why aren't you planning to secure a bunch of wonders? (of course you need to plan carefully so your power graph and expansion don't suffer too much)
If you are not industrious but do have stone/marble then why aren't you planning which key wonders you want to nab?