Oh, a St Emilion grand cru, that's yummy!
No, I've never had that wine, but I have had other St Emilion wines. Unlike the left bank bordeaux (Médoc), the right bank (St Emilion and Pomerol) use more merlot than cabernet sauvignon.
In the Bordeaux region, there are several systems to classify wine, the Médoc (including St Julien, St Estèphe, Margaux, Pauillac) system and the St Emilion system are the main ones. You had a St Emilion, which has grands crus, while the Médoc has 1st, 2nd, 3rd, 4th and 5th crus (1st is better than 5th, all are excellent).
Generally, if a bordeaux wine says "cru", that's a good sign.

Confusingly, this isn't necessarily true for the rest of France (although it is, I believe, true for the Alsace region as well) - it can be a meaningless term in other regions.
Glad you liked it. 2000 is a great year for the bordeaux region.
Yes, wine can be expensive. We had a Pauillac two days ago that cost roughly US $25 and yesterday we had a Chianti classico that cost $10. With the taste of the Pauillac in my memory, the chianti (which was pretty good) didn't taste as good as it would have had I not known that there are better wines out there. I
try to save the more expensive ones for special occasions.
Know where to stop. I hope to never taste a Château Pétrus, the most expensive bordeaux wine (a Pomerol) there is. Otherwise I could not go back to affordable wines.