If you're open to earbuds, I'd say check out the V-moda bass freq's...they're going on sale for $24.99 with free shipping on order over $25 at Amazon, so you'll have to find a filler to get that free shipping. Anyway, these are so much better than the ipod earphones, and the bass response is superb for an earbud at this price. If you listen to hip hop or music with a lot of bass, you'll like these. Please know that these are the in-ear style, which some people find very uncomfortable. They do an awesome job of keeping ambient noise to a minimum IMO...
And those Sony MDR-V700's do not go for $250. Here's a site that's selling them for $99 shipped, and DJDeals is a reputable seller. I bought my denon headphones from them. And don't buy the Sony's MDR-V700's...they're notorious for breaking...I've had many friends that have had them and had them physically break at the joints within months. There's even an online petition against these:
http://www.petitiononline.com/sonymdrv/petition.htmlV-moda Bass Freq's:
http://www.amazon.com/V-MODA-Bass-Freq-Ear...6052&sr=8-1Sony Headphones:
http://djdeals.com/sonyMDRV700.htm