Peach is the one fruit where you are usually OK with the standard seedling stock. If you have bad nematodes you may want Nemaguard - generally thats only a problem in sandy soils.
The difference in difficulty of various peaches is not super great - they are all difficult for the backyard grower. The main thing is get a variety more resistant to bacterial spot and brown rot. Baby Crawford is highly susceptible to bacterial spot so I would not recommend it. There are still a very large number of varieties to choose from, too many really as each nursery can have very different ones. Find some varieties that sound good and look up their disease resistance with Google, or ask here.