No time like the present. Its a purchase I've never regretted. I sold my original 1-iis because I was on a spree, but regretted it shortly and wound up buying a pair of Amperiors to replace them.
I would recommend the 1-ii over the Amperior, though; I have the Amps and they are great, I get a lot of mileage out of the inline mic and the sound is awesome, but the old school 1-ii had a clearer, more neutral midrange and slightly tighter bass.
I do get a bit confused on the models of the HD25. The names and numbers are weird.
That being said, this HD25 and FiiO amp set for $149 seems tempting: