advice on equipment (headphones, microphones, sound cards)

["Chang, Maria" <Maria.Chang@xxxxxxxxxxxxxxxxxxxxx>]

Hello,
 
I am purchasing equipment for auditory fMRI experiments run off of a laptop.  I am looking for a sound card (PC card, usb, or ExressCard), headphones and a microphone.  
 
The recording capabilites of the sound card and microphone don't need to be top of the line, they just need to be good enough for us to record quality auditory stimuli (i.e. we will not be collecting speech data from subjects).  Although, if a sound card with outstanding recording capabilities is only slightly more expensive, then I would be willing to invest in it in case we decide to collect speech data in the future (same goes for the microphones).
 
So far I've found the following options:
 
Headphones - Sennheiser HD280 PRO
Microphones - Shure SM-93, Audio Technica AT803B
Sound Cards - Echo Indigo, M-Audio Transit, Digigram VxPocket, SoundBlaster Audigy 2Zs, SoundBlaster X-Fi Extreme
 
Any recommendations (on or off this list) or objections?  Any advice is greatly appreciated!
 
Thanks!!
 
-maria