The os and frequently used and start up programs to the ssd,,,everything else to the hdd(including mapping all the storage from the os and ssd prog's, to the hdd). Small apps can be on the hdd since they start fast from there anyways.
Remember, that install/uninstall is about the only place the hdd beats the ssd. So, to install/uninstall to your ssd will significantly lower its speedy performance in the short term. Erases and benching do that to ssd's.
The goal is to be sure of what will benifit, and what you need/want, from the ssd speed.
Just because you want it to be faster doesn't mean it will be, just because it's on an ssd.
Games will only load faster. So conserving the ssd space and having it on the hdd would be my preference.
16gb for c: is doable depending on the os, since the admin and other profiles/folders can be mapped to hdd during os installation,,but as stated 16gb not recommended since your other c: programs would have limited space. To maintain speed/health -> an ssd shouldn't be filled up close to capacity.
Investigate the storage options on the prog's going to the ssd.
Example - If your emails folders content are stored on you pc, you could have the prog on the ssd but change the folder storage location to the hdd.
I agree with the 60gb minimum and to not install/uninstall to the ssd.
I disagree that having an ssd isn't worth it.