I don't know what you mean by dimension. If that means depth and width...you're not going to get that with earphones. You will get much better clarity, evenness of sound and lots of drawdroppingly good stuff from earphones, but the naturlness of speakers, and real instruments in real space can not be had. I agree with CKoffend. No one knows as much about headphones as do they. Just reading their website is interesting and factual.
3-d sounding headphones.....
ANy cans that image like mini-monitors...had Grado...and they are very nice...but looking for something a little fuller and more dimensional...Sennheiser? Akg? Ultrasone? $200 max...can go used