As for paint brands: Crown/Dulux in high traffic areas like the hallway and stairs. Doesn't matter how good the paint or the paint job, these areas are always going to look ratty within months/weeks so something you can wash/touch up/repaint without too much expense. Crown Sail White is a nice white if that's your jam.
Johnston's colour match on Fired Earth tints is very good. I've used their waterbased satinwood in the Fired Earth oyster on skirting boards, internal doors, window frames, picture rail, fireplace surrounds a lot. Again, you can spot sand and touch up chips quite easily - harder with oil-based paints. I also used Fired Earth tint by Johnston on our bedroom walls (Opal) and that has come out really well.
For smaller and more standout jobs, I am absolutely in love with Mylands emulsion and eggshell. The latter is absolutely brilliant on both wood and metal. The pigment and coverage is fantastic.
Farrow and Ball do sludgier colours than Mylands, and sometimes that's what I want, although I'm less convinced about the coverage and quality.
People say great things about Little Greene, and I"m hoping they're right because I've just bought 5 litres of their intelligent emulsion to use in the sitting room, and will also be using Atelier Ellis emulsion and eggshell.
Good luck OP - painting is hard work to do well, but you can really change a room with it for not a huge amount of money.