IMac Core 2 Duo vs MacBook Air i7

hi all,
Q: performace-wise, which is "better"?
iMac:
2.66ghz Core 2 Duo
New MacBook Air:
1.8ghz Core i7
some background:
a few months ago (march 2011) i purchased an 11" MBA (1.4ghz Core 2 Duo, 128GB HD (currently with 80GB free), 4GB RAM) and i love it.
ever since the mba came along, i've been using my iMac (2.66ghz Core 2 Duo, 320GB HD (currently with 120GB free), 4GB RAM) a LOT less - if at all.
and with the release of the new i7 macbook airs.. i'm playing with the idea of selling the imac and my current mba.. and replacing both with a new beefed up mba.
from a (simplified) tech spec comparison i'm looking at this:
iMac:
2.66ghz Core 2 Duo
320GB HD (currently with 120GB free)
4GB RAM
Current MacBook Air:
1.4ghz Core 2 Duo
128GB HD (currently with 80GB free)
4GB RAM
New MacBook Air:
1.8ghz Core i7
256GB HD
4GB RAM
obviously an air-only set up has it's downfalls.. namely: inability to play/burn cds and dvds (unless i buy a superdrive) and a few other monitor/peripheral issues - but obviously these can be resolved with additional purchases... if necessary.
can you see any other pros/cons here?
but i guess the main question for me is - what's the difference between a Core i7 MBA and a Core 2 Duo iMac with an extra 0.86ghz?
Cheers,
Pete

oops! my bad.
first off.. i don't use any of my macs for gaming.
a lot of my general day-to-day use is the standard web browsing, email checking, iwork, etc, etc
however, my more "heavy-duty" activities would include:
mixing/editing songs and drum programming using GarageBand (for drum programming/simulation i use a plug in called "EzDrummer")
basic image editing/manipulation with a program called "Seashore". basically a majorly simplified version of Photoshop. i quite like it, and it gets the job done to the point i need it done. however if the work i'm currently using seashore for increases to a point where i need something more.. i may end up needing to use Photoshop.
it might also be worth mentioning i do a lot of browser-based web design/editing with cms and ecommerce platforms like lightcms and bigcommerce.. but doubt you could really consider this to be "heavy duty" in terms of processing power, etc?
there's a possibility i may need to start using iMovie for a new job i'm about to go into. but that would be for editing 5min videos.. not 3 hour epics..
i also use iChat and Skype every now and again. and am required to remotely log in to various places using Remote Desktop and the like... but again.. not sure how "heavy duty" these tasks are. just figured i'd throw all possibilities out there

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