Several really good disease-resistant varieties are: Liberty ( most peoples' go-to DR apple ), Enterprise, Goldrush, Galarina, Sundance, Priscilla & Chestnut crab. There are more good varieties, but these are usually available at nurseries that sell to habitat folks & organic orchards. A lot of guys like Honeycrisp too, but I have no experience with it and can't speak to it's disease resistance or ease of care.
If your soil is a clayish type loam - as opposed to sandy, lighter soil, MM-111 ( or EMLA - 111 ) would be a good rootstock for that kind of soil. This info was given to me from the head of Penn State's fruit tree program. That rootstock is resistant to collar rot and wooly aphids. It's well anchored and doesn't need to be staked. It'll grow a tree between 18 and 24 ft. tall according to nursery charts. B-118 is also a good rootstock for a larger tree in the same size range. We have both those rootstocks at camp and they both grow well in heavier, clayish loam for us.
If you want to plant this spring, you want to order quickly so the nurseries don't sell out of the good varieties. At this point in time, I'd look at Adams County Nursery (ACN), Stark Nursery, Saint Lawrence Nursery (SLN) - although they use Antonovka rootstock on their trees, which will grow a full-sized tree and is fine for most places. SLN has Enterprise, Goldrush, & Priscilla in their catalog. ACN has Liberty, Enterprise, Priscilla, & Galarina I believe.