I love so many of the premixes, for different reasons. They're a great way to change the intensity level of the workout, to suit what I need for the day. My favourite premixes are from the Body Blast Series.
For an intermediate, non-step day I particularly love KPC's premix (the fourth one in the list, I think) that does the warm up, intermediate intensity drills, combos 1 and 2, core work, and stretch.
SJP has a premix that circuits the workout as follows:
step section 1; hi/lo segment 1; weight segment 1;
step sectio 2; hi/lo segment 2; weight segment 2;, etc. etc. You get the full SJP workout, but by circuiting it this way, it is actually more challenging.
I love the SB/SJP premix that circuits the SB step segments with the SJP weight segments. One version of this premix includes the SB challenge at the end, while another version does not.
I love the KPC/LG premixes a lot. The 82 minute one is awesome.
BootCamp's core premix can do miraculous things for your core.
Happy Premixing!
Sandra