Weatherking is Rheem while Rhilco is Nordyne... Nordyne is big on the manufactured housing end.
10 Seer Builder units are normally recip, but most manufactures have a step up series that offer a scroll compressor.
As you likely remember the installer is the key to your system reliability and longevity. Along with a proper load calculation.
BTW, welcome to HVAC TALK and how'd your mother make out? Any problems?