I'm a massive fan of Bella Rose homes. They are slightly more expensive than ROOST but about 10x the quality.
All of their homes look beautiful and are well made and easy to decorate, so no weird issues when applying textures to walls etc.
They're very low prim too which for how good they look is amazing. My manor house which has 6 bedrooms, 3 bathrooms, a huge living room and kitchen, as well as outdoor pool, patio and a movie room comes in at 490 prims.
I did cost 10k though, so like I said, awesome but expensive.