If 16 bits works for you, the iRiver is an excellent recorder. SPDIF in, nice preamp, very small, solid construction, good battery life and easy outboard power (4xAA). They go for about $100 on ebay when they come up. Load it with Rockbox freeware, push one button to turn it on, another button and you are rolling. 20 or 40 gigs. FM radio to boot! Only the H100, 120, and 140 models have the features required.