The Hollis HD100 is a decent rig, but as a Northeast diver, the biggest question you have to ask yourself is: will it 'grow' with you (that is, will it still be a servicable rig as your local diving experience increases)? If you're happy sticking with an Al80 and a pony, then the Hollis is a decent buy. But if you see yourself eventually going into doubles like many Northeast wreck divers, then a plate will be a better bet in the long run. No point buying two big-ticket items when you can just buy one, right?
There's no end to the combinations of plates, harnesses and wings available in the market. Myself, I'm a fan of Deep Sea Supply's plates, and their wings are pretty sweet, too. Dive Rite, Oxycheq, Halcyon and Hollis are also great manufacturers to consider. If you haven't already, round up a couple of buddies and take a road trip to Northeast Scuba Supply in PA to see everything in the flesh: Crazy John (the owner) carries just about every brand under the sun, and he's amazing to talk to, too. Try to resist the temptation not to buy everything in the shop (I dare you).