OS X :: MBP/iPad MBP/iPod Touch Or IMac/iPad?

I'm new to the whole Apple scene, been using (and still am using) Windows up to this point but now that I've saved up some cash I want to make the switch. Running a 4-year old Windows desktop and 1-year old Windows netbook right now, sick and tired of this!

I'm a photographer, so I need a computer that can edit photos and video and not just to browse. I spend 5 days a week at my University and the weekends at home, so there is a little issue with the mobility. I have over 30GB of music by the way. Budget allowing, I can get the [ MC511ZP/A - iMac 27"/2.8 ghz Intel Core i5 /4 GB/1 TB HD/ATI Radeon HD 5750 with 1 TB ] as an iMac, or the [ MC373LL/A - MBP 15" 2.66 Ghz i7/4 GB/ 500 GB HD/ 512 MB GDDR3 Intel HD ] if I were to get a Macbook Pro.

Given the circumstances, would it be more reasonable for me to get the MBP+iPad so that I could have a powerful computer I could easily move between my two houses while at the same time having a super-mobile tablet to use in school and for non-heavy duty computing activities, the MBP+iPod Touch which would be the same concept as the iPad but then I'd have to use the MBP for e-mailing and web browsing and just stick to having mobile music, or the 27" iMac which gives me the most bang for the buck and a really pretty screen while having the iPad as my mobile computer although it would mean I would have to go 2-3 days a week with only my iPad as a computer excepting long vacations when I would just take my iMac back to our family house?