...
is blockchain wallet ok?
Yeah, I think blockchain.info wallets work, but I would really suggest installing bitcoin-qt as you can sign messages a lot easier (not sure if you can with blockchain.info) which you'll need to change settings at Eligius. Download and install bitcoin-qt anyway, it'll be a good lesson ;-)
Then go here to learn all you need to know:
https://bitcointalk.org/index.php?topic=441465.0Happy hashing!
Also, how did you get your current setup to be hitting the 600GH/s? What type of miners and what speeds do you have running? I'm curious