Don't know about the Pan Am but I upgraded from Meier Audio Jazz to WA2 and it was totally worth it. Additional clarity and presence. I think if you're planning to stick with the T1s, the WA2 is a wise investment.
If you're looking to add orthos to your headphone collection I'd consider a more versatile amp to save you upgrading your amp again. Spend a bit more upfront to save later on.
Edited by aive - 7/28/13 at 2:23am