Reply to Best mp3 format for vinyl digitizing

I have for many years now digitized my vinyl using soundforge and then converted to mp3 16bit 128kps 44100hz. i want to improve my sound quality. i noticed that soundforge allows me to record in 32bit 328kbs 48000hz. are all three of these compatible with the U-Mix-control pro mixer and Cross DJ. are they advisable settings for increased quality. (i have a recent alienware laptop with over 1tb of storage so processing power and storage are not a problem). can anyone recomend any other combination that would be desirable. also is there a problem of mixing mp3's with diffrerent sample frequencies, and bit depths. Any advice would be greatly valued. Thanks Jim