Bearings can be a lifetime component, don't change them unless there is signs of wear. Change them in pairs, there is no need to change all 4 if they don't need doing.
Don't polybush anything if you value your comfort.
Stick to genuine/oem parts for longevity and comfort. Some consumable service parts should almost always be genuine/oem - ball joints, top mounts, bearings, bushes, seals, gaskets, coolant, oil filter, fuel filter, fuel pumps, dizzy, coil, cv boots,
Other consumables can be any make/model - brake disks, brake pads, spark plugs, oil, air filter, leads, dizzy cap, rotor, gearbox oil, timing belt, aux belt, waterpump, pas fluid, radiator, matrix, bulbs, clutch
Keep an eye open for the following OEM brands
Lemforder
Continental
Mann
Elring
Bosch
Dayco
LUK
Sachs