If your preferences run to warmth and smoothness, I would second Bozo's recommendation that you try a tube preamp. That may also give you the power you seek. Start by auditioning something which is neutral tube-y like a CAT. If that doesn't pull your chain try something more 'romantic' like a Cary.
P.S.Do you have wall-to-wall carpeting with a pad? That makes a huge difference!
P.S.Do you have wall-to-wall carpeting with a pad? That makes a huge difference!