As the Lee filters are so damned expensive I only got the soft grad set. Made this decision based on the fact that I don't just shoot sunsets and seascapes. Professionaly I do Interiors and Exteriors for Posh estate agents, so the soft grads were the ideal choice as i there isn't always a definate dividing line between sky and land/sea.
I think the filters you've chosen there should suit most circumstances, and you can always stack them.