If you need headphones for portable listening, I would not recommend the ATH-AD700 or A700 headphones. Because of their split headband and light clamping force, the headphones literally bounce up and down on your head when you walk. I noticed this from walking around campus with them on my head, and it is very annoying. Not to mention just how obnoxiously large they are. You can't really carry them on your neck or put them in a bag, they are just too big. The A700 doesn't block sound that well despite being a closed design and the AD700 is completely open, so they aren't great in public places such as on the bus either.
Both the headphones you looked at were closed, circumaural headphones, so here's my recommendations.
1.) Audio-Technica ATH-M50/M50S:
If you can find the ATH-M50 around $100, it is definitely worth it. $150 is pushing it. They have decent sound isolation, excellent comfort and great sound quality. They also have extremely good build quality and feel very durable, and are easy to carry around thanks to the pivoting ear cups. They rest just fine around your neck, and fit inside a bag well.
Get the ATH-M50S if you can, as it has a straight cable. However, the coiled cable of the ATH-M50 is very easily manageable for a coiled cable, so pick whatever's cheaper. It's not worth paying $20-$50 extra for the straight cable version.
2.) Sennheiser HD280 Pro:
Another option is the Sennheiser HD280 at about $80, which has the best isolation of any stock headphone I've ever tried. Some people complain about the headband clamping a bit, but I never had issues with that myself. They aren't very heavy on bass, so bass heavy genres like dubstep aren't the best match, but you have the exact opposite musical tastes, so these are still a good fit. They are slightly bigger than the ATH-M50, but fold up the exact same way and are much easier to find at a lower price. The coiled cable can be a bit of a pain sometimes, but is manageable.
The HD280 comes in both Black and Silver. I prefer the black version. Weirdly enough, I purchased a silver version, but I received a black version in a silver version's box. 
I know there are plenty of other options at this price range, but these are the headphones I've either owned myself or have had the opportunity to try for more than 30 seconds.
Recommend:
- Audio Technica ATH-M50/M50S (If you can find at around $100)
- Sennheiser HD280 Pro
Don't Recommend:
- Audio Technica ATH-A700/ATH-AD700