Setup for Premiere Pro on Laptop with SSD/HDD
The question is whether disk performance is critical in your normal workflow, in which case you'd want to place the footage on the SSD.

I have a similiar setup with Sony Vegas and I observed that, disk performance is rather uncritical during rendering, because it's always the processor that's the bottle neck. But your situation may differ from that. Especially, if you have a very fast CPU and a very slow HDD.

Alternative 1:

The following configuration works well for me:


OS on SSD to have fast boot time
Vegas/Premiere on SSD to have fast startup time
Video footage on HDD to have all footage in a single location.
External drive for backuping your footage
All other stuff: where-ever there is room left. Just make sure there is enough storage for your videos on HDD. 750GB fill up very quickly with HD footage ;-)


Disadvantage: May be slow with fast CPU's and slow drives. Project opening times may be slow as well.

Advantage: Fast boot and programm start. All footage in one place.

Alternative 2: 

Of course, if OS+Premiere+Video fits to the SSD, put it there. This will give you the fastest experience. Plus the option to have a very fast backup to the HDD and a second slower backup to the external drive.

Advantage: Fast. Double backup.

Disadvantage: Not much storage for footage.

Alternative 3: 

Put OS+Premiere to SSD and video to HDD. Place the one project that you're currently working on to SSD. This configuration is also very fast, but I sometimes experience issues with moving projects across the drives, so I try to avoid that. 

Advantage: Fast.

Disadvantage: Possibly issues with moving footage/projects around.