I would like to here someone who can win on emperor,or deity?
I win on Emperor every time, and I win on Deity if I put a bit of effort into it.
I just find it very hard to give 'tips' on how to win. I just got better by practising, and by realising what to do, and what not to do --- although I can't explain what these 'whats' are
Don't build wonders, however tempting it is. If I start off with Ivory, i'll spark a GA with a UU (in an early war), and then build the Statue of Zeus -- but this is the only wonder i'll ever considor building. This is only with C3C.
One of the main things you should aim to do, is an early war. Once you've won, the game is in your control. You will be larger than every other civ, and more powerful than every other civ. Along with clever trading, you can't go wrong. You should spend a fair amount of time trading btw.
Saying this, it isn't difficult to win by being a builder. Just don't go for the early war, and build some (good) wonders every now and again. Clever trading is a must...
I've been quite ambiguous with my advice, mainly because even if you do these things, you're not sure to win - it could still go horribly wrong, depending on how you play the game. It's all to do with practise in my opinion

So go away, and don't come back till you can beat Emporer

(don't bother reading the War Academy either)