We don't need Reus at all and he is not that good either. Where is he supposed to play? No, he is not and will never be the replacement of Don Andrés.
Personally I would rather buy a 5 years younger Depay for instance for a lower transfer fee or a similar one.
Messi, Neymar and Suárez are not going anywhere for a long time to come. Pedro is an excellent substitute that never complains and mostly does his job. We have homegrown talents too waiting for their chance to prove themselves on this level. The last thing we need are established attackers.