i sample using a vestax pmc 05, i've had it ages and its pretty bust up (cross fader and one channel no longer working), but i only need one channel to sample.
the vestax is a very simply designed mixer that (used to) use high quality (japanese) components.
when you sample you want good pre-amps and as direct a signal path as possible.
steer clear of behringer, and any mixer that seems to have a lot of features for the price.
You could just get an amplifier???