University setup:
13" MacBook Air (2011)
32GB iPhone 5
Samsung Galaxy & Nokia Lumia (Development Phones).
Use my MBA for everything: iOS, Android and Windows development. Run both 10.8 and Win 8 on it, only limitations I have found is the small (256GB) SSD, but use an external HDD for all my media etc. Hoping to buy a 27" Thunderbolt display in the near future to make working on projects for long spells of time a bit more comfortable. The Air takes everything I throw at it, and don't really have any complaints about it at all.
At home:
iMac 21.5 (2010)
iPad WiFi 16GB
Never touch either of these, even when I am at home, other than using the iMac for storing movies etc. The MBA has replaced both, the speed eclipses that of the iMac, and massively outclasses the iPad in terms of usefulness. Probably update to a new gen iPad or iPad mini in the future as nothing beats the iPad on long journeys and flights.