We don't really need a top class wide forward unless you don't rate what Sanchez, Walcott and Oxlade-Chamberlain can do from those positions. That said you might well advocate selling Walcott.
NB I'm not saying we shouldn't buy Reus, but I'm very reluctant to break up what we've currently got going on in the front half for a lesser player.
For me I'd try to hang on to the likes of Cazorla and Walcott, I'd look to strengthen either central defence or defensive midfield, and add one player who'd still be getting selected for one of the front three positions with our current form and options. Leave the options open a bit—one defensive, one offensive—and focus on getting in "super quality" …
Ideally fix GK as well, but you can't have everything.