I had no trouble navigating in what you wrote; it was understandable. I'm wondering...are you trying to recommend the CKS1000, or are you trying to put out the SE215? Is the SE215 bass quantity actually greater than that of the Solid Bass series CKS1000? And if so, what kind of signature does the CKS1000 have? I did not detect obvious bass bleed in my SE215, so is the CKS1000 just that controlled, tight, and clean? That would be unexpected, especially considering other Solid Bass models having a relatively boomy low end. And I'm certain that the SE215 sells for $100USD. Almost everywhere. Even if you do live in Singapore, you could easily find it for $100USD (approximately $122SGD) somewhere, even if it's internationally shipped. Hence, the true difference in price can be approximated to be $100USD. Back to the sound, I'd really hate to sound like a broken record, but the SE215 is really a good earphone, albeit not the best in its class, and I do not find the bass overpowering the mids, but maybe the CKS1000 is consequentially even more amazing than I could predict (I hope to try them out soon, especially after hearing this). But, in reality, I'm not even recommending the SE215 to OP. Let's end this petty debate on the SE215 vs CKS1000 and get back to the real question (I am, however, largely at fault as well for this off-topic argument as I did somewhat instigate your response, and for that I apologize). I have changed my recommendation (slightly).
To OP: If you plan to not use an amp, I recommend, yet again, the GR06 (for under $100) and the GR07 (if you are willing to stretch your budget...a lot). If you have a portable amp, check out the RE262. They are one of my favorite earphones under $150, and perform exceptionally well.