[guitarman68]

RedEye Twin is a great option if you do not need seperate EQ before blending. A less expensive option would be BOSS LS-2.
If you want separate EQ before blending a K&K two channel preamp does the job as a used DTAR Solstice does. On the opposite side of the price range you will find recommendations of the Grace Felix. In between there is the Headway (previous model with separate EQ).