I'd be careful about leveraging in this market. If you must leverage i'd seriously look at New Albany Ohio where they are building those intel chip plants.
Putting that money in a low cost area (central pa?) and milking that cash flow on paid for properties sounds like a plus in this market. Your downside risks are limited and you can save that cash flow for a down payment on a rental in another market.
As for property managers. I recommend finding one that doesn't just manages homes but buys and sells homes. That way they have a carrot over their heads. If they do a good job, you're inclined to let them be the seller agent. That's a big incentive for them. And don't be afraid to get outside vendors not affiliated with the property manager to do repairs and maintenance. Being out of state you want to try and keep everyone honest. Look for vendors that have good reviews. Get multiple quotes, ask the property manager or realtor if you can set up for them to visit the property and check on work done by contractors. Basically a liaison.