Gatecrasher and Cream arn't all that good. These clubs are massive but totally commercial in the UK. I don't know what the U.S perception of UK clubs like these are but in the UK it ain't great for hardcore clubbers.
Clubs like Crasher are full of 'crasher kids' (fucked up junkies who wear cyber clothes) and kids who want a fight.
Get yourselves down to The End or Fabric in London for some undergorund, basement shit. No dress code, famous djs, best sound system and best atmosphere.
The End is owned by Mr. C, I will definitely check it out whenever I make it to England. From personal experience, Twilo was the best, before Sasha and Digweed began their residency. When Tenaglia was the resident, along with Doc Martin, and they had a decent door policy. The music was mind blowing and the crowd was perfect. The one club I am dying to go to is Space in Ibiza, I read all types of crazy shit about that place