As you can guess from the title i'm new in this forum and new to the "headphones" thing. Searched a while to find out what the "best buy" would be for me in my price range (which is ~125£). Many people recommended M-50 and DT 990 (http://www.amazon.co.uk/Beyerdynamic-DT990-PRO-Headset-250/dp/B0011UB9CQ/ref=sr_1_1?s=electronics&ie=UTF8&qid=1315167962&sr=1-1 and http://www.amazon.co.uk/ATH-M50-Audio-Technica/dp/B000UVGI6O/ref=sr_1_1?s=electronics&ie=UTF8&qid=1315231812&sr=1-1). They are both around my price range, but as far as i have read, the DT990 need an ampliflier to sound "good". It doesn't matter if it's closed or open.
My three questions:
1) How much difference does a portable ampliflier do and what ampliflier should i get if im willing to pay about 25£?
2) Is there any alternative to M50 and DT990 that i should consider?
3) What should i get?
What i'm going to use the headphone for:
Music(Everything but classical)
Games(NOT a high priority)
Im going to use it one the move(15%) (iPod Classic) and on my PC(85%) (not a laptop, Onboard soundcard)