I would recommend getting a home inspection on any new construction home. The best home inspectors in the business is Highland Home Inspections @ 410.772.9932.
Ryan homes is a very reputable company. However they usually do not pay a commission to real estate agents which means you are on your own working with the builder's representative on negotiation. There is always negotiating room but it helps if you know in advance the current re-sale value of similar homes. Sometimes the price might not be negotiable but getting an option like a sunroom might be. They often require you to use their lender to receive any special savings and you will need to know in advance that most builders do not split the transfer and recordation taxes with you which will add thousands to your closing costs.
If you'd like me to check the specific community you are interested in to see if they co-op I would be happy to do so. You would then have the right to no cost (to you) representation.