In the end, I may get an Athena sub. After getting 3 of the Crown XLS202's, I highly doubt the wife is going to let me spend $400(+) on a sub. Not to mention the new display I'm getting. I've never really heard the 400, but the sub that came with the Micra system was one powerful bastard. It's almost rediculous that a sub that small and inexpensive could be so good.
SRoy, while I love the sound of my C1, you're right about it not being able to keep up with the larger mains. When I really push my system, the C1 starts to faulter before my F1's. What I wouldn't mind doing when I get a bigger place is modding an AS-F2 for center speaker use. Tqlla went in this direction with his F2, and the results are hugely impressive:AS-F2 Center
Not THAT's a center speaker lol. When I have a larger room and front projector, that'll be my new center. I just wish he'd get back to me on how to do it lol.