The PreSonus Eris 3.5 (2nd Gen) monitors ($99 per pair) offer studio-quality sound with a compact design and 50W amplification.
The JBL Professional PRX800 ($1,345) series has a 1500-watt amplifier and JBL differential drive transducers for clean, detailed sound.
The SubZero 6" Active Studio Monitor ($551) is a compact, versatile speaker with a solid wooden construction and low-end response.