This topic comes up every few days, so there are lots of other threads and opinions you can read. That being said, instead of buying $500 cans, you could get both nearfields and headphones. Get a pair of Tannoy Reveal 502 for $89 per side from Guitar Center, or a pair of JBL LSR305 for $120 per side, and also get a pair of Beyerdynamic DT-880 Pro for ~$200. If you got the Reveal 502s you'd have enough money left to buy a $100 headphone amp to power the 880s nicely. That way you could have nearfield and headphone monitoring for under $500.