definitely strength, because some bows are heavy, so DH need strength to carry a heavy bow to aim

no seriously, go for armor because it feels right

IMO, for DH, 56K DPS with SS is not exactly good.
You need to improve that. Try to get 50K DPS without SS.

I have seen many DH with high damage (100K without SS). But they are KOed after 1-2 hits by white mobs.
What's the point?
These DHs will need a total revamp of gears in patch 105. Waste of money and effort.

Go for a balance build.
i.e. you need adequate life recovery (LOH/LS) so that you can ignore any reflect damage
i.e. you need adequate damage.
i.e. you need 500AR + 4000armor (with the gears like Vile Ward, it is EXTREMELY easy to get high AR and armor).
i.e. you need at least 40K of HP.
It is a safest best to go for a balance build.
You have plenty of selections of gears at AH now. It is very easy to obtain such stats.

Just a tip, go look for Manticore at AH.
Extremely cheap.

I just bought another Manticore with 771 LOH & 2.9% LOH for 8.99m.
A faster 2H crossbow. Extremely cheap and awesome item for life recovery.
Decent damage (for my build, 70K without SS / 160K with SS).
(Note: If you want both LOH & LS, you can only get a single slot Manticore)

P/S My build is not godly. But it is good enough for me to farm in A3/A4.
I can easily dish out 120K-150K damage.

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Added on October 3, 2012, 1:35 pm
Sorry, my bad. I mixed up the HP with my meelee heroes.
My DH has 35K HP.

http://us.battle.net/d3/en/profile/ALeUNe-6127/hero/20320620

wow. thats impressive.