Hi,
For those still searching for the wireless headphones option I add my thumbs up to the guy who introduced the Sony WH-L600's into the mix.
I took a gamble and just got a pair and have to say I'm extremely pleased. They are not that cheap but the sound is really good compared to what I have used in the past. Latency? I can't really discern anything - there may possibly be a tiny amount but nothing that affects your playing.
In the past for practice I used a cheap pair of wireless non digital Sony's but the sound wasn't great. They gave up then I went to a pair of Sennheiser RS120's. These recently failed hence I was looking for another option. The RS120's sound was awful especially for distorted sound and the headphones easily slipped off as they lay flat across you ears.
Glad I found the topic on the forum and got put onto these SonyWH-L600's - I can certainly recommend.