If you won't be able to return them, I guess it depends on whether you can justify the expence in the event you don't like them. They are two $25 pieces of foam after all:b If you go for the 225s, maybe you could seek out some GS1K/PS1K owners in your area? Grado pads are universally interchangeable and pop on and off very easily.
Maybe search a bit around the forum, this subject has been covered in great depth on here before.
If you decide to get the big bowls, you may or may not like what they do to the sound of the 225s, but you're gonna love them in terms of comfort(:
Edit: Or 80i's or whichever Grado cans you might end up getting
Edited by _nomad - 1/8/13 at 6:33am