The MPx200 is gone, and I'm back to a Sony-Ericsson phone. It's a T616 this time instead of a T68, so it's a bit bigger and faster, but the basic design is the same. It's still a pain to look up phone numbers, and the UI is still way too back-button intensive, but it works.
On the plus side, it syncs flawlessly with the Mac, unlike the MPx200, where syncing was an adventure each and every time I tried it. I'm slowly cleaning up the damage that PocketMac did to my calendar--one entry moved from PST to GMT for no obvious reason, and a couple birthdays are missing. I'm still waiting to hear back from them on my bugs, too.