This may be a bit further out (especially given my rather conservative nature), but you might consider one of the new coatings from Pinnacle Black label. I wouldn't recommend a "newbie" starting out with a coating, but, if you read the threads carefully, Pinnacle Black Label Paint Coating is so easy to apply that you shouldn't dismiss it. Moreover, it will shed water, salt etc. like no sealant can.
I recently coated my wife's car (PBLPC). She went on a trip to FL and got into heavy insects. She bought a pail some soap and a bug sponge and never had to use the soap or the bug sponge. The water alone did the trick. Being experienced with FL bugs, she was amazed!
We're putting PBLPC on her new car when it comes in, BTW.
Having said that, if you want to go with a sealant, Klasse is very durable and will get you through the Winter in Harrisburg. It was my go to sealant (along with Zaino Z2). I have switched to Black Fire Black Ice for the special look that it has. It also should see you through a Harrisburg Winter with no problem if you take care of it.
Most decent products will get the job done. Some are a bit easier to use than others.