I vote fork first, wheels next, replace the bars only if you feel like they're too wide or narrow or if your hands hurt/get numb all the time, ride everything else until you break it and then upgrade.
I just got a Fox Float RLC TALAS fork for my XC bike and so far I love it. Suddenly technical climbs and descents are smoov like buttah.
I don't know if lock out is "a must" but it makes a big difference in efficiency on long fire road climbs, especially when you're riding a fork with 4-5 inches of travel. The RLC TALAS locks out really solidly and you can also adjust the travel down to the minimum--making both the lockout and your geometry more effective for big climbs. Both functions take only a second to adjust so you can do it on the fly.
Air shocks have the advantage of offering more resistance the more you compress the shock. The air pressure builds at the bottom of the range so maybe you're less likely to bottom out. With a coil shock the impact is just distributed evenly over the length of the coil. But probably the best reason to go with an air shock is that it's become the standard for XC bikes, and you don't want to "upgrade" to an out of date fork. The down side is you'll have to buy a shock pump and check your air pressure every couple of rides.
I can't understand why people are frightened of new ideas. I'm frightened of the old ones.
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