Have had lots of cans, mostly sennies. Said this before, I now enjoy cans but it took a dedicated can amp and sennies HD600 with Cardas wire loom. Untill then, it was never my thing.
So I would say spend the 2k5 if you can, though it is double 1200, 1200 buys little hifi these days and if it can get you to a top of the line heaomes a relatively small amount. Maybe you wont need replace in a year or so if you buy better to last, it is prolly a saving in the long run.