Armor crash is useful at ht. It's also useful at zak if there's not a bishop dispelling (not positive that priest's dispel works on zak arms, taking this info for granted without double checking).
Relax is good, but lvl 11-20 relax yields LESS gain. Shout is fine, not useful at all. I only use shout when doing quests that ask to kill xxx weak monsters, or i use shout to explode papu floor bombs while papu is in its shell.
I recommend eventually having maxed crashed (in my opinion, if it's not max then it's not worth using...just for show). The animation for crash takes a long time, i only use mine because it's maxed and works 100%.
My final suggestion by lvl 120 is maxed shout, maxed crash, lvl 11 mp recovery (or you can max mp recovery and trade off the sp with shout).
For a good and reasonable build for a hero: there's only one way to start off the build o.O
Here's what i think a hero build should basically consist of:
1 brandish, 1 ac, 1 rush
max brandish
max ac
max stance
max mw/rush/achilles
1h heros do the same, but max guardian towards the end.
mw isn't particularly useful or important since everyone has mw10 (and many have mw20). if you solo often, you might look into mw10 or maxing mw before stance...i guess if you solo often you won't be bossing much (zak or ht) so stance won't be such a big priority.