I'm US9.5 with EE feet, and have the same issues with you. I've found that Under Armour kicks have the truest to fit for wide footers, simply cos their forefoot fit is wider than Nike's or Adidas'.
For comparisons, I wear US10 to US10.5 for most Adidas balling kicks, from the Rose 1.0 to 3.0, with the 3.0 giving me the most comfortable fit in a US10. This could be a great option, as the Rose 3 is an excellent shoe for guard-oriented play, or if you're a predominantly slashing-type of player.
I wear a US9.5 for my Under Armour Bloodlines; best in length and width, and the Micro G cushioning is excellent. Another great option!
Nike's I normally have to wear a US10.5, and most of them (Kobe VI, VII, Hyperdunk 2012 lows etc) are very narrow. The only ones that I can wear without pain are the Hyperfuse 2010 (US10), and most Lebrons (VI to IX in US10).
I really like the Lebrons... you think 13.5 might work for me? I'm also checking out the Under Armour ones, but I like the look of the Nikes more.
The Lebron VIII PS and the IX are th only ones I've played in (the VI is more for casual wear) and in comparison I find the forefoot wider than the other Nike basketball lines. Like I said I can normally go half size down from 10.5 to 10 and still be ok. If your normal size is 13, 13.5 in Lebrons should be ok. But it'll still b best if you could try them on, if that option is available