You may also want to consider your mixing style.. especially when choosing a mixer.
Ed & Dan are quite right and your current mixer will almost certainly have a channel where you can switch between line for your CD deck & phono for your turntable.
This will do the job if you are happy just to do A to B type mixing but for me I think you would be missing an opportunity.
Id go for a mixer with an extra channel(s) which would allow you the chance to do more like cue more than one track, have a scratch deck, play a acapella...maybe over 2 tracks , double track stuff and loads more fooking about type DJ business phones:
If say you like to play progressive house then maybe there is no need but having an extra channel might add a bit of fun for you
