1- Best allaround headphone. IMO (k550)
2- Best 'bass' headphone. IMO (Pro900)
3- Best headphone for noise-cancelling.
4- Best headphone for the budget.
1. dynamatted K701; T90; dynamatted SR325is; A2000X; HD650; DT880-600 (the only one on this list that I do not own) =p
3. DT770 with SRH840 pads or K545 with SRH750 pads, I can't decide.
4. What budget? Very, very low? KSC75 then, that's practically a rule of thumb here.
3. Bose QC15
4. M-Audio Q40