I'm planning on geting a new iMac sometime this summer. but I'm still a bit torn between just having a 500GB hard drive installed from the apple store when i buy it, or doing it myself. has anymore upgraded their Hard drive on the intel mac & how hard is it? the hardest upgrade i've ever done is upgrading the DVD drive + hard drive of my old eMac a long time ago. so should i save the 100 dollars and do it myself, or just bite the bullet and but it ready built from apple???