+1 on the CLA4 for a single-hander salmon/steelhead stick. Balances really nicely in my experience, and it gives you plenty of room for sink tips and/or extra backing.

Congrats on the purchase. I wish I had a reel like the Nautilus for my spey rod. I am currently using an older Lamson 4 (one I bought off eBay - yeah, I'm a cheapskate, out of sheer necessity). It's a nice reel for sure, but it just barely holds a Skagit head and a marginal amount of backing. It's also a little light for the rod, which results in a bit of soreness at the end of the day from having to extend my swinging arm further away from my body to compensate for the imbalance.

From what I understand, Nautilus reels are highly regarded for saltwater fishing, which should mean they are exceptionally tough and corrosion resistant. If you use it as a spey reel, you will likely die before it does. That retrieve switch complication and the sealed drag system that necessitates it make me think that you'd better take really good care of it, though, as repairs probably wouldn't be cheap.