I have a 27" iMac and I'm looking to get a new laptop as a companion for iOS app and game development, perhaps some OS X apps and indie games. What would be the best MacBook 11/12/13/15" to handle the workload. I'm not wanting to go for the dedicated GPU model (that's what the iMac will be for) and I'm waiting for the next line-up before I buy. I'm just looking for people experiences in what has been the best development experience for them with the different tiers of laptops. I want to get a laptop because I travel a lot and would like to continue working while I have downtime.