What to play for the Cryptologic Bonus

[phillydilly]

I normally play party, and i'm starting to whore the crypto sites, i dont want to take my entire bankroll out of party and would just like to use a few hundred to clear these. I was working on it at limit 1/2 and barely 50% of my hands were raked. Any advice on which limit to clear this at 1/2, 2/4, 1/2 pounds instead of dollars, or .5/1 NL?
thanks