I've been a dealer for all 3 you mentioned. The Sunfire was my least favorite in my home. (I don't like them myself)The Velo would be my first choice. I use three of them in my own theater to this day, which doubles as my main 2 channel rig. (2 12", and an 18") That being said, for the money, the PSB's are EXTREMELY musical. (also a dealer for them) If I were to start from scratch, I'd be using the PSB's. The only sub I've tried, and may like better, are the JL's. If you have any specific questions, you can email me at zydo1966 at yahoo dot com. I'm not looking for a sale, but, would be glad to help you if I can.
Jamie