Yang, Mike, and all,
Great questions! While all of the options may seem dizzying, the great thing is, most will work just fine. I have my opinions, and others have theirs. Simply put, there are many ways to play this game. John Bilotta and I have fished for Stripers, Shad, and other species out here with everything from 11' - 15' rods, and in nearly every line weight configuration.
My short answer is, any two-handed rod from 11'-14' that will handle a minimum Grain weight of 400 Grains+ will work great. Beyond that, it is a matter of preference. In my opinion, I like a longer rod because I can span the widest range of conditions if I have a single hand 9' rod and a Double in the 13'-14' range. I find when I am fishing BIG water (for anything), I like my BIG rod, and when the water is small or the fish are in close, it's hard to beat a single hand rod, especially if you get proficient making Spey Casts with it. A switch rod is light and fun, and it nicely fills the niches between these two scenarios, but it is certainly the master of neither.
About the surf, there are several schools of thought, and all are valid. Personally, I much prefer my long rods in the surf and fish my 14' 9weight the most. As you know, the surf zone is BIG water, and a long rod has many advantages when lifting line over waves, repositioning line for another cast, and casting repeatedly with the least amount of effort. Again, these are only my opinions, but they are based on actual fishing experiences with rods from 9'-15'.
About the Erie/Ontario tribs, I have far less experience than others here, so I hope Richie, Rob, John, and others will chime in. The tribs I have fished for Steelhead I could cover extremely well with a single hand rod and Spey Casts. There are many specialized lines made for this type of fishing these days as well, which can maximize the efficiency of single hand rods in the smaller streams.
For lines, I fish a Skagit line with different tips in both the Potomac and in the surf. Many internet forums suggested that Skagit lines and sustained anchor casts would not work well in the Surf, but I have found the opposite to be true. There is merit and value to learning to cast and fish with other types of lines, and I do, but day in and day out I find the Skagit set up to be the best for what I do. Especially since stripping line is a useful part of my retrieve for imparting action to the fly when fishing Shad, Stripers, Bluefish, etc. Of course, I can swing with it two when that is the desired presentation.
About the reels you both mention, the Hydros 5 will have plenty of capacity for any Switch or Spey setup from 11'-14' and for line ratings of #6-#9. I think it is a bit big actually for the 11'-12'6" rods, but that is my opinion. I fish a #5 Mirage (same capacity) on my 14' 9weight and find the balance to be perfect, but I had to back it with Gel Spun (GSP) to get the capacity I want. The Access #4 reel mentioned will work on a switch rod, but will be a bit light to balance anything much over 11' in length, regardless of line rating.
By far, the best thing you guys can do is get down on the river with John Bilotta and others when we gather for casting sessions. Most of the rods described above are available for a test drive, and with nearly every line system imaginable. I hope this helps a bit, and I look forward to other's opinions.
Dan Davala