Have you demoed them beforehand and what are you planning to use to drive them?
The T1 is really a love/hate relationship. Personally I find the treble to be a little sharp, I love the HD800 though. You may want to get a more powerful amp. Sure, it drives the T1, but not to their full potential. I quite liked the bottlehead amps.
Have you tried the T1 with a LD MKIV? I know two people who've used the combo - both loved it. According to the specs it'll put up to 500 mW into a 600 ohm load. Even if it only gets to 300-350 mW, it's more than enough to drive them well.
I was a big fan of the K701/2, DT880, and love my HD700 - also wish I'd never sold my SR325i - so I'm thinking the treble should suit me well.
Like I said earlier - both amps I have handled the 600 ohm DT880 with no issues - so I'm not expecting any problems.
This is going OT for this thread though - I'm equally as excited to hear the incoming RockJaw IEMs. I'm expecting big things.
I do wish to see a more detailed picture of the unit itself, though xD Will be posting mine when it arrives. It seems like all the impressions are very positive ATM so good job RockJaw! and thanks for having this event for us
What unit and pictures do you want?
I can take photos of the Alfa Genus and Arcana if needed.