Honestly, it's probably going to be tough to find quality earphones with exactly the features you're looking for. Most of the models with inline volume controls
and microphone are iPod/iPhone specific.
However, there are plenty of good earphones with microphones and inline call answer/end buttons. I think you can safely forfeit the inline volume control, since the "rocker" volume control on the Arrive works while the lock screen is enabled. If you're going to be using wired headphones, your WP7 should easily be within reach anyway.
I'd look at the Bose MIE2 mobile headset on the high end and the Klipsch Image S2m on the low end. If you want to roll the dice and try one of the models designed for iPhone/iPod, the Klipsch Image S4i earphones are pretty solid. I don't have the "i" model, but the standard S4 earphones I have were worth every penny (the only difference being the inline volume/call control). The Sennheiser CX 880i earphones *might* also work but are a bit more spendy and may not be worth the gamble.
Good luck!