I second Travian. The gold buy options aren't that big an advantage, if any at all. Anything you can do with them you could do by playing or just being smart. The one big one I used a lot was the 1:1 market which lets you trade X of a resource for the same of another. However each round you start with free gold and it's enough for ten or so trades.
Travian however is very stressful and very competitive. You also have to be smart, and diplomatic. People who've built up for months are often taken out entirely, every last town destroyed, because they smart off to a neighbor in a PM and the neighbor decides to bomb them with troops and catapult waves. I've personally taken out a few such people in the rounds I've played.
However, the game is highly skill based, especially if you get in early. By the end you'll easily be managing 30 different towns, with tens of thousands of troops, sending resources all over your empire, and working with allies to secure the round victory for your side. It's the best browser game I have ever played.
They have versions of it in many languages and countries.
http://www.travian.com has a list of countries and their sites along the top if you're interested.
I'd suggest starting on a normal server. If it's too slow paced for you, see if there's a 3x speed server starting soon. 3x will start out at somewhat of a slow pace even too (at least for me), but by the time you're 2-3 months in you'll be spending hours on it.