Top sides always have excellent 'keepers. Obviously that's a generalization, but it's rare that teams that win titles do so with a shaky stopper. It's fair to say that that a top center forward isn't likely to think, "Yeah, Liverpool is amazing; they have Reina!" But at the same time I think the top players understand that a lack of solidity at the back could damage their chances of silverware. Top players like Fabregas, for instance (not suggesting he's going to come here, merely that Arsenal may be forced to sell an unhappy player this summer).
The question for me is not so much whether Reina thinks he has a future at LFC, but whether he thinks he has a better future at Arsenal or Atletico. For me he's better where he is, but I thought that about Torres (and have so far been proven correct), but he left anyway. So what do I know?