Which microphone should i get?

ive been looking for a microphone that i could buy without breaking the bank, so ive narrowed it down to these three. a href="http://pro-audio.musiciansfriend.com/product/MXL-990-Condenser-Microphone-with-Shock-Mount?sku=273156" rel="nofollow"http://pro-audio.musiciansfriend.com/pro…/a - one question i have about this is what would i need for usb support. a href="http://www.zzounds.com/item--SAMC01U" rel="nofollow"http://www.zzounds.com/item--SAMC01U/a - i would have to get a blemished version, and i how is it powered, could i be ready to go when it arrives. a href="http://www.musiconmypc.co.uk/samson-q1u-dynamic-usb-microphone-stand-cakewalk-software" rel="nofollow"http://www.musiconmypc.co.uk/samson-q1u-…/a - not really a fan of getting a dynamic mic for doing clean vocals, but it is cheap and i would rather get this than a shure. so can anyone help me