ad2ks arent all that big and i challenge you to find a better portable AD
I bet the Mytek 192 would give it a good run for the money and similarly sized.
Marc, 402x > Oade m148 > Sony D50 is awesome sounding and incredibly compact. If you want a full time portable 24 bit ADC def. check out the Mytek. I know you love the AD1K sound and it's in the same ballpark. Is the AD1K I sold you still kicking?
I've got quite a few 4021 > m148 > D50 and Mytek 192 recordings here if you wanna sample:
http://www.archive.org/bookmarks/B_Porter