I'm quite new to the audio equipment scene so bear with me. I'm looking for a set of earphones to replace my last pair, which were the ones that came with (or used to come with) hp laptops. They are my benchmark for earphones because they weren't in-ear and they had a sliding volume control and I thought the sound quality was good (enough). So now I'm looking for a new pair to replace them that's decently cheap but has the same or better quality and still has an in-line volume control. I don't mind if they're in-ear though. (I have been looking at Sennheiser MX580, MX581, CX 281, CX400-II, and Koss KE29 but have no idea how good/bad they are.) tl;dr I need recommendations for earphones that have volume control for under $30. Thanks in advance!