I really wanted to get a pair of ATH-M50's but sadly Wal-Mart doesn't sell them on their website that I can find (have m30's and m40's though). Since I have to return the Beats there I have no choice but to go with what Wal-Mart has.   I probably should have mentioned that I listen to mostly...

So long story short I got a free pair of Beats Solo HD (bleh) and am returning them to a Wal-Mart for store credit. I plan on using the money to buy a good pair, but obviouly has to be on Wal-Mart's website. I'm debating between these four: Sennheiser HD 448 Sony MDRV900HD Audio Technica...