This is one of the few coins that actually benefits from ASIC. A small amount of people running USB Scrypt ASIC (I guess they'll come eventually) for a couple of watts a day help maintain network transactions along with the PoS method. Anyone running a supernode would probably be doing such a thing since it's not really much of a hassle.
I'm not a stake expert, but the only thing that worries me is, on Hobonickels for instance, having lots of people stake causes high stake difficulty, which also increases PoW difficulty. I'm not sure if this is intended by design, or if the two should be unlinked somehow. Hopefully PoW difficulty doesn't affect PoS difficulty for this coin, if so, running a Scrypt ASIC to help keep the network up for 0 rewards would effectively be griefing the stake holders, even if your intentions were good to help the network.
If PoW and PoS difficulty are required to be linked, then running a PoW algorithm suited for CPUs only would probably be the best choice.
TLDR version: If PoS and PoW difficulty have to be linked for whatever reasons, the PoW algorithm needs to avoid ASIC. If they are unlinked, ASIC is beneficial for this coin in particular.
Maybe someone else who knows more about proof of stake systems can comment.