LFL, the Dark Side takes no prisoners.....
I agree with Ganman on rod action...it appears that there is no true standard by which all are measured. Subsequently, one brand of 5-wt might be equal to another brand's 4-wt or yet another's 6-wt. Makes rod selection a lot more of a "personal feel" choice rather than a choice based on rod wt. Most reputable dealers with load a few rods for you to test in the parking lot.
Todd makes a good point about backbone, too. I have an Orvis Trident 9-wt which can handle some pretty big fish and toss some hefty flies, but I'm not sure how well it would handle your 30 lb muskie.....you might go for a rod designed for saltwater fishing or learn to spey with a heavier wt rod.
BTW, for larger fish, the reel becomes more important than it does for lighter rods. If you decide to fish for muskie, get something with an above average drag system. Just like a baitcaster or spinning reel, a good drag system can mean fewer lost fish. Oh yeah, get lots of backing for those big boys.
You'll probably love (new toys!) /hate ($$$) doing the research.

Time's fun when you're having flies.