I recommend The Missing Sync as your sync software, since it supports a wide variety of devices, and syncs with Entourage X and Entourage 2004 just fine. If you want something that's more user-friendly, choose a Palm OS-based device. If multimedia on your handheld is what you want, go with a Windows Mobile-powered device. Make sure you choose one that's on the supported device list for The Missing Sync, though.