My flags are:
phoenix -u http://username_1:[email protected]:8332/ -k phatk VECTORS BFI_INT FASTLOOP=false AGGRESSION=13 DEVICE=0 WORKSIZE=128
BTW
Ive ran deepbit, slush and btcguild each for at least 24 hours, in my honest opinion BTCguild is bringing some nice speeds, although i do get periods where theres no work, but this last for a max 4 seconds, hardly any refused shares and take into account the 0% fee!
Ive also ran Phoenix and POCLBM, again, my best speeds were gained using phoenix and the phatik flag.
Now planning to buy either another 5870, or a 5870x2 (drooling at the 850 hash rate!)
Good luck finding them. Every site I have checked is sold out and there are no stores like Fry's anywhere near where I live.