I've tried the ones you mentioned and a few others. I preffer the Murfdogg Synergy 6.5T, www.murfdogg.com and also found on the RCTech thread. All of those motors are great, offer fantastic performance characteristics and can put you on the podium. The Murfdogg Synergy's are incredibally smooth and offer both tremendous torque/high RPM's. The owner, Matt Murphy, and builder, stands behind each one and offers fantastic customer support. You can contact him at [email protected] for specifics and applications to suit your needs. Wish you the best in your future decision and hope you obtain the powerplant your wanting.