Newbie help with headphone gift choice.

Yeah, you want some higher sensitivity ‘phones if he’s driving them off a laptop or tablet.  First, you did some good research and identified some really good candidates at the price point.  Hard to say without knowing your brother’s sound preferences, but if he’s ok with a semi open-back design I’d go with the AKG, but if he needs a closed headphone I’d go with the Sennheisers as they tend to go straight down the fairway sound wise and not offensive in any way so very safe.  He’s clearly not an audiophile so your first choice should be whether he’d be better off with sealed or open ‘phones.  After that I don’t think you could go wrong with any of them and I’m sure he’d be thrilled with any you so aptly chose, but u gotta get the closed versus open thing right.  If he’s in a room with other people around or with outside noise you want closed headphones, and if not I’d go open.  Hope this helps!

The Sony are clear and crisp sounding. The Sennheiser and AKG tend to be warmer and a bit dull. I haven't heard the AT. 

Thanks to everyone for your input. I went with the Sony MDR7506 Professional since he wants to try some recording of guitar music. I gave them to him early and he's using them a lot,