Quick thing on poll – Princess Sofia is the Expo Hotel
I will be at the Sofia.
Also and I always say this look at apartmenst as well if you are doing more than 3 nights and there are a more than 2 of you try oh-barcelona.com
What ever you do though book soon – Someone just pointe dout to me teh 24th is the biggest festival in Barcelona so it will be rammed. Should be good though as apparently there are street festivals and all sorts all night long