As the title says, I'm looking for a good portable amp within $150. To me they'll be used for reviewing and just listening to music in general. Since it'll be for reviewing, I'd really like dual outputs for two headphones to A/B. Battery life shouldn't be much of a problem, but at least 8-9 hours would be great. Thanks in advance for the suggestions!
NOTE: I won't be buying the amp yet...I'm still saving up some cash.