Dude, get with the program -- it's 24bit instead of dat these days, and your cell phone operates as a flashlight, no need for a lighter.
I've got an Oade R44 for when I run 4ch stuff, but for 2ch, I've been running this rig. Very compact obviously, and sounds quite good.
Unfortunately, to answer your question, there really aren't any small 24bit ADC's I know of -- just things like the V3, MMe, Mytek, AD2k. Seems like a good line-in on a recorder is the best bet for keeping it small. I guess Oade and Busman modded recorders might help on that front. I do like the D50, but 3.5mm input only isn't something I'd normally recommend for a serious field rig. With the EAA velcroed to the D50 like I have though, it keeps the 3.5mm input/output fairly secure so nothing gets pulled out.