Eventide Mixing Link - £150

freemeat

Great mic preamp/headphone amp with separate effects loop. I was using it for a stomp box effects loop to go between clean vocals and vocals with guitar effects on them. Worked great like that but you can use it in loads of ways like a vocal headphone amp, guitar headphone amp, a/b/y (and the reverse) signal splitter. 

"A stompbox size audio toolkit for on stage, in studio and everywhere in between. Includes a quiet high gain mic-pre, 48V phantom power and enough I/O and control for applications such as FX Loop for microphone signal processing (vocals, horns, strings, etc) , signal splitting and combining, complete re-amp setup, impedance and gain matching, mixing and more." 

Bought for a project then barely used. Some velcro on bottom but excellent condition otherwise. £170 now £150.