These headphones will likely be used 80% gaming and 20% music/movies. I saw all of the love for the AD700 but am afraid they'd not sound as full as I'd like. So, I've just about settled on the Samson SR850 for $50 but am concerned that they won't be comfortable when gaming for multiple hours. I've heard of owners swapping out the ear pads with AKG K240 replacements, but at $30-40 that drives the total cost up around $80-90.
So, is the general consensus that the SR850 will require the replacement pads to be comfortable? If so, am I better off spending a little more to get into something like the HD558 (other recommendations welcome)? Priority is 1) positional audio performance and sound stage without fully sacrificing bass and 2) comfort. I'll be driving these with my Creative SB Z card and its integrated headphone amp.