I presume you want to use a cost effective integrated amp
The Primare I 30 would be a fine unit with offering a dual Mono power supply and 180 into 4 ohms
here is some script on the unit
Best Johnnyr
The multi award-winning I30 powerhouse is capable of delivering 100 watts into an eight ohm load and 180 watts into a four ohm load. Fully balanced topology from input to output ensures that the I30 will supply a highly stable and symmetrical signal to your loudspeakers. Each channel is equipped with its own power transformer and multiple dedicated power regulators to keep colouration low. There are two balanced inputs (XLR) and four unbalanced inputs (RCA) for six sources and an optional phono stage for vinyl. A simple, ultra-low noise rotary control selects the sources, and level adjustment is via a large tactile precision-engineered volume control. There is a preamp output for biamping, a record output and phase selector.