For the better part of their 8 yrs as my primary system front end my Song Towers (std) were driven with my AVA FetValve Ultra 550 amp. Roughly 250 wpc into 8 ohms, so effectively 500 into 4 ohms (+/-). A year ago I picked up Frank's Ultravalve tube unit, 35 wpc, and really would have no desire to go back to the Ultra 550. Just my preference, but loved the difference and didn't miss the extra watts. While I can't speak to the SS side of the equation, simply on watts I'd think you'll have no problem driving the Song3s more than adequately. Of course YMMV. Note that all the below noted factors do come into play - room size, treatments, listening preferences.
for info preamp was primarily AVA Ultra EC, with some AVA T-8 time, and finally AVA CF as main pre.