@Glenn C did you find the answer you were looking for?
I'm still working on things. I lean towards the Avidyne but my installer made me a pretty good quote for the Garmin. Bryan Kahl put me in touch with a sales rep that said he'd get back to me after the holiday and I'd like to hear his pitch. Also, it looks like they are starting another trade in program for the 430W's like mine so that could be a huge factor in the decision as well. In the meantime, I did ask a few questions and got a few answers back, Here they are in case it helps someone else
Does the IFD integrate completely with the Aspen 1000 pro?
Yes it does
Does the IFD work with the Cessna 400B autopilot?
Yes it does
Will it get traffic and weather information from the garmin transponder?
Yes it will
The JPI currently feeds it's fuel computations to the 430, will it do the same to the IFD?
Yes it will
Can the 540 function as a display for a digital airborne weather radar?
The IFD can support the RDR2000 and RDR2100 Digital radar
Is Jeppsen the only source for charting? The annual subscription isn't too bad, but a single trip kit for a vacation to the islands becomes pretty outrageous.
The IFDs are a Jeppesen based subscription. We provide 60 days of subscription free service after the unit is installed
Are there audio alerts that feed into the PS engineering panel?
The IFDs will provide audio alerts for terrain awareness, altitude alerts, and approach call outs
Thanks for your offer. Your panel looks nice, what kind of plane is that?