Blackpool have a great combination of passing football, huge collective effort and a defence who wing it somewhat, meaning that they rarely have a boring game. I'd still go for Arsenal, though Spurs have been better this year (Chelsea are the least attractive out of that top 5, they just look for Drogba early and try to hit him).
Barcelona, though, are just so far ahead of everyone else as to make comparisons worthless. The best club side since Sacchi's Milan, and the only side around at the minute who will go down in history alongside greats like the Ajax team of the early 70s or the Real Madrid team of the 50s. In fact, if they carry on like this they might just become the greatest single team of all time.