Karen, my understanding (not having used the product) is that the ProMix for cacti has extra perlite mixed in, and should work for your purposes. If at any time you want a faster draining mix you can add more perlite or pumice to about 50% of the total. The mixes based on composted bark tend to be long lasting and retain good drainage for a while. You can make almost any organic component (including peat) work well with the right amount of fine gravel (perlite, pumice, etc) mixed in.
Your new yellowish plant looks like an Aeonium (look for the fine marginal hairs) and it will grow fairly large and branchy given time and space. Aeoniums tend to be winter growers and slow down in the summer. They make excellent starter plants for propagation so when your plant grows lots of new heads you can consider chopping one or two to start new plants (best done in the fall).
The Aeoniums Database
When you repot your new plants, be sure the new pots have holes at the bottom, and ideally they should be wider than they are deep. Aim for a size just bigger than the rosettes, and repot in relatively small jumps in size for best results.
