Why 24h deepbit.com gives 1.5 BTC and btcguild.com gives 2.3 why such difference ?
On deepbit.com is more speed then on btcguild.com.
You should not use deepbit.
They're too big and therefore bad for bitcoin as a whole.
Use p2pool instead.
You should probably also mention the p2pool downsides. Someone mining at deepbit for a while might not be used to the variance. Don't want to give anyone unrealistic expectations and put them off p2pool once they experience it.