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I too would recommend Magic Mouse. It's only drawback is price.

And how uncomfortable and cramped it is.

Not for users who have been using ergonomic mouse. The magic mouse leaves your hand aching.
 
it was the first mouse i looked into actually, however seems that there might be better alternatives especially when i'm not going to use gestures from lion much when i'm spending my time in lightroom or photoshop.

Well, it really depends. I use Lightroom and Photoshop almost every day save for when I have classes (2 days a week), and I find that the Magic Mouse suffices for most use cases. Granted, I don't do extensive editing in Lightroom. Mostly just color correction and split toning, but in Photoshop, I use the pen tool and pan gesture (one finger slide on the Magic Mouse) to navigate around a lot, and there is no other mouse on the market that can do similar.

Plus it's low-profile so it doesn't stick out like a sore thumb while in my bag.

But that's just a suggestion. Obviously, there are more precise mice out there. However, I find that in terms of Bluetooth mice, it doesn't get a lot more precise than the Magic Mouse.
 
When I got my MBA13 I was pretty set on having the magic mouse. It looked so sleek and sexy and I figured the gestures on it would be really cool. I was very wrong.

Extremely uncomfortable unless you have tiny child's hands and it's hard to gesture on it without it sliding around under your hands.

I do require a mouse though because I do some analysis work that requires finite movements that my touchpad just can't do comfortably or efficiently.

I had the Microsoft Mobile Mouse 6000 when I had my PC and kept it in case I didn't like the magic mouse.

It's amazing. Tiny TINY TINY usb receiver, smaller than a quarter that adds negligible size to your Air. It's comfortable and I have gone almost 6months without replacing the battery. I leave it on all the time and that mouse only "wakes up" when the receiver is near by.

It uses that blue track technology and I have yet to find a surface I can't use it on. It's cheap too. The Razer Orochi was pricey; this cost me $35
 
have you consider an up side down mouse?

aka track ball :)

I have used all kind of pointing devices: mouse, trackpad, trackball, thumb ball, etc. both hands (not ambidextrous, just want to reduce strain).

The most accurate and least effort one is a trackball like the Kensington Slimblade http://us.kensington.com/html/1436.html. I like the fact that you don't need any space for your mouse to roam. So with a laptop where you may be working on a couch with a lap tray, it's perfect.

And if your arm ever get sore from mousing, try switching to a trackball and you may find that after a few days, your problem is gone. I have known a few people with repetitive strain injury from using a mouse who switched to trackball and found immense relief.

On the other hand , the trackpad in the MBA is great too for minimizing RSI. It's just not accurate enough for some people for some very fine task. I have a trick: when I need to move the pointer a very small amount, I roll my pointing finger.
 
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