Thank you all for your answers, it sure is full of nice people here! ^_^
I'm going to GP Paris next saturday with no byes and I'm undecided on the deck, beign reanimator and UW stoneblade the major contender (though I can build every deck without imperial recruiter).
Reanimator is appealing because it eats other combo and rogue decks alive while having game basically against everything: sometimes it is just too fast. It's also a deck I'm quite familiar with and it's nice to bring a fast deck to a big event because you can rest between matches. However there are decks with so much hate...
UW Stoneblade, on the other hand, is a more solid deck: answer their threats, propose yours and win the game. It reminds me of the fair Magic I played in 1995...
However is a deck that I have not tested much (brought only to a small event)...

