Ha now I'm going to convince you to do the wrecks requiring a passport
If you grab a charter through islanddivers you fill out all your info (passport etc) 24hrs before departing. They send all the info over the night before and clearing customs is just a verification process, usually pretty quick.
I know you're probably jonesing to use that shiny new drysuit but like the others have said you'd probably have more fun going wet. Once you get it nailed a drysuit becomes second nature but that requires several dives to get that comfort level. A lot of people severely underestimate the current in the SL in places, couple that with low vis and it could add unnecessary stress. Another thing you may not have thought of.. Getting used to a drysuit will pretty much kill your buoyancy and reduce your air consumption by a good margin. Remember you're no longer sleek and streamlined but rather wearing a loose fitting (compared to wetsuit) bag of air. It takes a little more effort to move it through the water. All these issues will disappear after 15-20 dives but it is a consideration when your new to them. If you're in the GTA area I'd be glad to run you through some pointers at any of the local quarries around here if you want.
Now onto the wrecks..
The muskie.. Aside form the fish I never understood the appeal of this dive. I've done just over a thousand dive in the SL and have only done the Muskie once. Just never wanted to go back.
Gaskin is a fun little dive, most folks do it from shore but first timers without a guide would probably be better off with a local charter..
One that I didn't see mentioned is the kingshorn, just outside of rockport. It's a very nice wreck, think Gaskin but in much better shape.
Lilly is a decent wreck, I enjoy poking around inside and doing the circuit from bow to stern plus the drift after is amazing. Just keep to 40-80ft or less and close to the wall. Drifting too far from the wall could get you into some of the crazy upwells and downwells which I would avoid at all costs. It's not pleasant tooting along at 40 (honestly the shallow drift is better since there are more critters), getting caught in one and getting sucked down to 100+ in mere moments isn't fun but it's actually better than getting caught in the reverse and an ascent that's going a lot faster than you want (again this is a risk so stick to the wetsuit!!).
What you'd miss on the yankee side.
The Keystorm, awesome wreck! Stern is down at 130 and the bow up at 25, plenty to see in between:
The America, big steel freighter sitting upside down just outside the shipping channel. This is a good wreck for fish.
And of course the Daryaw since it was mentioned, really like this wreck. Too bad it's gotten to the point engine room penetration is no longer a good idea (too unstable), a very pretty wreck inside the twisty places but still loads to see in the open areas. Lots of fish as well.
Make sure to switch playback to HD, youtube defaults to 320 or some nonsense now a days.
So there is brief review of some of the wrecks out that way. If you want info on the shore dives (lost villages etc) just let me know.
I think you all convinced me to stay on the Canadian side for our first trip there so we don't waste time dealing with US customs, etc. My dry suit should be coming anyday now so I expect to do a pool session plus at least 2-3 dives out in Humber Bay with it before going to Brockville. And since I paid so much for it, I would like to use it as I do get cold easily.
Now it's deciding whether to stick with Gaskin/Parsons or do Muscallonge and either Gaskin or Parsons. Would like to do Muscallonge based on more marine life but how much harder would this dive be compared to the others?