i play in a loud punk/alt-rock/hard rock band and the 210xlt i have ain't making it. it's a great cab, but not for those circumstances. it's all i have so i'm trying to make due for now. i have a mesa walkabout head that gives me plenty of power and i play a 4 string stingray. most of our songs are in normal tuning, a couple in drop D. tried both the cabs at the local store and they both sound great and we're sick loud. i noticed (or thought i did) that the 212 responded faster than the 215. neither one had a problem reproducing the low D that was farting out through the 210. the dealer is willing to take the 210xlt in trade so it's just a matter of which one to go with. they're both about the same price. i'm leaning towards the 212 for size and for versatility. this is going to be a stand alone cab running at 4 ohms and the only cab i'll be using. do any of you have any thoughts or suggestions on this? thanks in advance.