Currently running my 1.7i with a pair of restored Adcom GFA-365 mono blocks. Finding a restored pair isn't impossible, but $1500 may be tight.
I have run them with as little as a 25 wpc Cary SEP and a 50 wpc Jolida JD-302b.
My ATI 1502 (150 wpc @ 8 ohms, 225 wpc @ 4 ohms) drove theme very well and can be easily found for under $1000.