Crossbowman heroes

[iBlue]

I'm close to level 52 and am probably about to receive a nice cash injection in the near future so i'm left with the decision on which hero to take if any?
I'm going to take my time (probably a month) to think about it and use my respec when it's off cooldown. I'd like to hear your toughts on the classes and perhaps (if possible) spark a debate which wont only help me but anyone out there that's undecided.

Classes:

Sharpshooter:
Chosen Marksman - Sharpshooter specialises in crossbows.
Aventurier- Sharpshooter specialises in one-handed weapons.
Pavise Champion - Sharpshooter specialises in shielding.

Pavise champion seems a great class and their shielding is at 9 if i am not mistaken?
Which is the stronger? I assume chosen marksman requires more items to be effective while pavise does it's magic with casual high-crafting items (non-house)
Proficiency doesn't play a large role in crossbow damage and so it relies on items. Is taking chosen marksman a worthy investment if you're not getting the neat crossbows anytime in the near future?
What are Aventurier's shielding stats? Is Aventurier the true hybrid of the lot? Does he only recive one handed bonus or a small twohanded aswell for the offchance that he would slash?
What is his power strike.

I'll think of many more questions as long as people are willing to answer. I find that hero information is scarce and bugging players to get answers isn't nice a topic debating the benefits and drawbacks of these classes would be most welcome!