I hear good things about andrew christian briefs.
Yes! For a perfect balance of comfort, affordability, and only a dash of underwear snobbery, Andrew Christian is a great choice.
Though that still doesn't solve his initial question of what style to choose to replace his boxer briefs, AC carries all kinds. I agree with trunks over regular boxer-briefs any day.
The two I would suggest to try first would be in the Almost Naked line:
Brief or
Boxer.
They come in quite a few colors. (I must note, they call them 'boxers' but they really are more of a trunk. However, sometimes the leg of my AC boxer/trunks can creep up my thigh, similar to his initial problem.) If there is any reservation about going to a brief, fears of having everything squashed together and up close to your body, the Almost Naked pouch solves that problem that most guys have with traditional briefs. And yes, buy into the sales pitch, they really are that comfortable.