My first proper mountain bike, the Vitus Sentier 29 VR.
It came with a 130mm RockShox Sektor Silver RL fork, 1x11 Shimano SLX drive train, SLX brakes, WTB Vigilante 2.3 (front) and Trail Boss 2.25 (rear) tires, and it cost just above CHF 1200.
I bought a 125mm dropper post with it, and rode it like that for a couple of months.
Then I went through a period of changing things: tires (Maxxis Shorty 3C MaxxTerra EXO TR 2.5WT for the front, Maxxis Shorty 3C MaxxTerra EXO TR 2.3 for the back), smaller chainring (30T), bigger cassette (11-46T), wider and higher handlebar (Spank Spoon 785mm 40mm rise), grips (Deity Knuckledusters), and saddle (Charge Spoon).
I exchanged the dropper post against a 150mm Brand-X Ascend and bought more tires (Maxxis Aggressor TR EXO Dual 2.3 for the back (didn't like it), Maxxis Minion SS TR EXO SW Dual 2.3 for the back (nice), then a Maxxis Assegai 3C MaxxTerra EXO TR 2.5WT for the front (brilliant!)). I exchanged the fork with a 140mm RockShox 35 Gold RL DebonAir, and the front wheel with a Stan's ZTR Flow EX3.
Later, I added two more tires (Maxxis Assegai 3C MaxxGrip DD TR 2.5WT with the DD carcasse for the front and Maxxis Minion DHR II TR EXO Dual 2.3 for the back) and was happy.
I currently ride the bike with the Assegai/DHR II combo in winter or when it is wet, and the Assegai/Minion SS combo in the dry. I may or may not have changed to an XT shifter, derailleur, and cassette.
My eldest daughter also likes to ride the bike, although it is a bit too big for her.
Next step: get a Pole Taival M frame and transfer all parts. That way, daughter should be able to ride perfectly, and it would still be ok for me for the occasional ride.
Next step for me: finish building the Pole Taiga.