Claws/SR is great late game, but very squishy as you level up. WP will give you a better overall leveling experience, but it's obviously harder to leverage defense late game, though it offers much better layered mitigation than SR does. As far as which secondary will leave more room for attacks, they're about even, each set has 2 pretty much optional powers, and you'll probably want to go into the fighting pool for both sets. Overall I'd give the advantage to WP.
As far as hasten coloring goes, no, you cannot color pool powers.
Claws is already a blindingly fast-recharging set, and SR gives you Quickness to stack on that. That's very nice, and to some extent you won't need to have lots of power picks open for attacks, since you'll be able to get them back fast enough to build a decent chain with a few attacks.
That said, I otherwise agree with Cyber_naut. My own Claws Scrapper is /WP, mostly for concept, but I haven't regretted it.
If we are to die, let us die like men. -- Patrick Cleburne
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The rule is that they must be loved. --Jayne Fynes-Clinton, Death of an Abandoned Dog
Claws/SR is my vote
My Claws/WP still sits at 40 something....
Could never really get into /WP myself (deleted my lvl 28 BS/WP because of boredom). My lvl 46 claws/SR is a beast though. She was fairly easy and inexpensive to soft-cap. My only con when playing her is that I feel sorry for any tanks on the team. I routinely beat them to mobs and absorb/dodge alpha before they throw their first taunt.
Why do I like SR over WP? Perhaps WP was too predictable for me. SR gives you a little risk, which for me, keeps the game interesting.
I'll cast a vote for Claws/WP.
If I can toot my own horn a little...
(Keep in mind I'm IOed out... almost)
S/L Res: 52.71%
F/C Res: 13.27%
E/Neg: 8 something
Defenses are higher than 10%, which isn't exactly ninja-mode, but it works for me.
1761 HP
1.42%/sec Regen
3.25%/sec Recov
11.5% Damage bonus
17.5% Recharge bonus (not including the Force Feedback proc I have in Shockwave, which fires a lot).
All in all, it's a very good combonation. But, in the end it's all up to you 
Just figured I'd throw in my two cents.
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You will return, for you are the mighty City of Paragon, the City of Heroes.
Thanks allot guys I will give it a shot. Claws/Sr it is.
Which will give me more room for attacks? I hear sr is actually good now and I like the concept idea of claws/sr I love to be fast.
And one off question can you change the color power of hasten yet?