Same here, except I'm only trying to send 100 DGC. And it's not prompting me for any fees.
My guess is that the transactions are too large due to being from a lot of little p2pool mining payments. But there ought to be some way around it. Having all the DGC I've mined be unspendable is not cool.
Replying to myself. *sigh*
Anyway, it seems I was right about that.
For the not-faint-of-heart there is a way to clean up "dust" transactions:
https://bitcointalk.org/index.php?topic=218447.20I took the easy way out. I split it up into smaller chunks and bit the bullet with my transaction fees.
I sent four payments: 50 DGC, 20 DGC, 15 DGC and 15 DGC. Total cost: 126 DGC with fees.
It might be time for me to give up the p2pools.