I have a chance to obtain a pair of Confidence 5's at a good price. I currently have a pair of Contour 3.3's that I like very much. What will the 5's do that the 3.3's won't . I'm looking for a similar sound, but more refined. More importantly do I have enough power to drive them. I am using a pair of Pass Labs Aleph 1.2's (200watts@ 8 ohms - 300 watts @ 4 ohms) that drive the 3.3's very nicely. I won't be able to audition before I buy (otherwise this post wouldn't be necessary) so any help would be greatly appreciated. Thanks.