I agree with those who suggest room treatments 1st.
If you want to try an amp less than $750 that can definately drive them, Ive got a recapped Carver M400 I would part with. 200wpc 8ohms, over 300wpc 4ohms. It drove my 1.7i s at high spl for hours without getting warm.
My new $2k + amp sounds only a little better in detail, but same as far as soundstage.