Figured it's about time to add my impressions so here goes...
Heard the HF-1's finally, to me they sounded like a punchier, slighty more dynamic version of the 225s with a more polite top-end. Worth $200? Yes they are a nice entry into the Grado house sound. Worth the $350-$400+ they go for now? Absolutely not.
I still think the k701s are pretty good headphones but I'm glad I sold them, just not enough bass to satisfy me over the long haul.
The PPX3 Slam is a very nice amp and I'm glad I'm getting one (albeit a slightly upgraded one).
Earl's Supra 392 was probably the highlight of the meet for me. Gobs of power and totally musical. A very nice amp indeed. Sounded heavenly with my apl philips as the source.