I've had great results with my PDAudio rig, recording both 16 bit and 24 bit with an external HD. However, the new PDAs like the Dell don't support external hard drives. You will need to record onto an SD card. You can pick up a 4 GB SD card for under $250. If you record 24/96 wav files, a 4 gig card will record for 2 hours. If you can record in FLAC, the card will last for 6 hours.