At least 8/9 speed 12-32 (or bigger), former will be cheaper and tougher, double will be fine, unless you want an even bigger range.
shifters - Thumbies? hoods on drops? bar ends?
Since you said you want the H-bar (and they're great), thumbies are extremely reliable especially with friction mode on the Shimano (not sure about SRAM).
wheelsets!
Bikepacking or the old rack/panniers? if former, get any cheap decent 29ers wheelset you can get, or get Novatec/Mavic XM719 for strength and longevity.
At least 8/9 speed 12-32 (or bigger), former will be cheaper and tougher, double will be fine, unless you want an even bigger range.
Since you said you want the H-bar (and they're great), thumbies are extremely reliable especially with friction mode on the Shimano (not sure about SRAM).
Bikepacking or the old rack/panniers? if former, get any cheap decent 29ers wheelset you can get, or get Novatec/Mavic XM719 for strength and longevity.