I have a 15" MacBook Pro with 2.66 GHz Intel Core 2 Duo and 4 GB of ram. I still found, that opening a 1080i video shot from my Canon t2i, very laggy. I'm wondering for those of you who do a lot of HD editing what spec computer do you use? Even a macbook pro can't really HD video. I'm thinking about upgrade to a desktop one like iMac. I would like to know what you guys' computer specs are and if you are experiencing any lagging when editing or playback. Thanks!