Reid Pitman wrote an answer about La Sportiva Xplorer Shoe - Men's on August 27, 2014
Hey Johan, So I'm in that same weird size range to. I wear a 10 - 11 depending on the manufacturer but I've found I wear a pretty strict 43.5 in the La sportivas. 44 they consider to be 10.5+ while 43.5 is about that 10+ size. I've not tried the xplorer, The boulder x, Scarpa Crux and Five Tennie guides are nice shoes but I wouldn't want to hike more than 10 miles in them. Five ten's preformed better (almost a trailer runner) but the sportiva's climbed better. Crux is a good all rounder.
The best all round approach\climbing shoe I've used yet is the Salewa Trainer, just the most expensive. The Sportiva Xplorer looks like it would be comparable. The quality is top notch. Like Scooter said, see if you can get a few sizes shipped of which ever you do choose.