ultraportable setup: Sennheiser HD 25-13 @ SE Xperia Mini
portable setup: Sennheiser HD 25-13 @ thinkpad X200T w/ Asus Xonar U3
home setup: Sennheiser HD 565 @ desktop w/ M-Audio Fast Track Mk. II
On those rare occasions when I need speakers, Verbatim 2.1 portable "system", that I won five years ago, works good enough.
Dynamic singing mic (Soundking EH002) is quite inconvenient most of the time, thus I've ordered few $2 mics from DX.com. In the meantime, I'm using webcam's built-in mic, which works okay in case of both Logitech C920 and MS LifeCam Studio.