[mrtramplefoot]

So I'm redoing my pc and decided I'm going to get a xonar dgx and I've wanted some decent over ear headphones for a while.  After looking for a bit I had narrowed it down to rx900's, HD681's, or sr850's.  For the price ~$33 I figured I'd go with the 681's and was looking at the e6 to go with them for listening on my phone.  After reading though some people said to get the most expensive can you can then get an amp later.  If that's the case, whats a good $60 can?  I listen to pretty much everything, but listen to a lot of music with heavy bass(rap/hip-hop/dubstep) so that's definitely important.
 
Thanks in advance