I had my main panel replaced with a new panel, plus all new upgraded breakers. A friend of ours is an electrician. He charged us $1,200 for everything. Took him about a day. I don't know how this compares to "moving" an existing panel, or if it's even feasible to move the panel...
I consider myself very capable in most areas, and even though I do some electrical work myself, this is something I would never attempt as a DIY project. Your local power company will need to be involved, as well as permitting and inspections.
I would call a few electricians and get bids from them. A licensed electrician is the right person for the job.
Hack (a.k.a. Jeff)