In reply to ripper:
I work for an online outdoor shop so come across this a lot. It depends a little on toe profile but the following options work well:
For all-round:
La Sportiva Skwama - very wide, fairly neutral toebox. Sizing 1.5-2 sizes down from street.
Scarpa Instinct Lace - wide, leaning towards greek foot profile. 0.5-1.5 sizes down. (personal fave).
For indoor:
Scarpa Veloce - hard to beat for comfort, some don't get on with the heel.
Scarpa Instinct S - similar fit to Instinct Lace but softer and a slipper.
Wild Card:
Tenaya Oasi - seems to work well for fairly square feet when others don't. 0.5-1 size down from street.
The new kid on the block:
Scarpa Generator - an ultra wide trad shoe. It's mega comfy but even 0.5 down is enough for really good performance.
Hope this helps!