Creek Classic (2x90) or Portal Panache (2x100) are two integrated amps that should have enough power and punch to drive your Paradigms. They have received excellent reviews, and both have good headphone sections, maybe the Portal in particular. I have no experience with neiter (I have heard the Creek in demo and was impressed), but you might want to take a closer look. Both headphone sections would put out more power than the Grado RA-1, which is designed to drive the "easy to drive" grado phones.
Good luck
Good luck