just purchased the brainwavz hm5 headphones.  Looking at getting a portable amp to use with my ipod and whatever else i will use to listen to music.  What would everyone recommend.  I would like to stay under a 100 and cheaper is better as long as i dont sacrifice quality.  I would also be into...

just purchased the brainwavz hm5 headphones.  Looking at getting a portable amp to use with my ipod and whatever else i will use to listen to music.  What would everyone recommend.  I would like to stay under a 100 and cheaper is better as long as i dont sacrifice quality.  I would also be into...

Ive done some reading but alot of the posts are older so as my title says im looking for a over the ear preferably closed back headphone.  I would consider on ear if i had to and prefer it to be somewhat portable.  I listen to a lot of rock music along the lines of the used, a7x, and metallica...