Thanks mate.
Would you say it makes more sense to go with BTC Guild?
Also my Estimated reward at slush pool are changing all the time.
Sometimes I will get 0.000231 BTC, sometimes i will get 0.000192. is that normal?
It's normal since Slush uses a method where the latest shares submitted are more valuable than earlier shares. If you have disconnects or pool hop, you'll see wide swings in earnings.