Hi there,
Is yours manual or auto? I love mine, it is so much fun to drive. I just got a greenbox just over a week ago, and yes, it is great fun... Buy Shoey's so he feels that he's getting something back, and you should get a good deal.
If you haven't had your alternator changed under warranty, you'd better get it looked at before your warranty runs out (unless it has already). Have a look in the Astra Diesel section for the "diesel issues" thread. Out of 20 something diesels on here, probably 6 to 8 of us have had it changed.
Enjoy the site and loving the torque!