I have a different priority order:
1) Lighter
2) 4GB of memory
3) Larger SSD
I certainly do not care about more ports, superdrives, etc. I am glad that it has one USB port, because it does come in handy from time to time. Buying the superdrive was a waste for me... I never use it.
4GB of memory is just more contemporary now, and should be included.
To the extent that battery performance, or energy efficiency improves... I'll take lighter weight over longer battery life.
/Jim
My priorities differ further.
I want to take a 3 lb. MBA. Maximize the performance capabilities around a 3 lb. MBA that gets a solid 4 hours between charges. I don't want ANY of the weight to go towards extra battery life as it adds weight and thickness I would rarely benefit from. I don't want a 7-hour battery at 3 lb. because it means we give up performance capabilities.
So I make priorities within the given constraints of weight and thickness. I am willing to accept an MBA that is .75" thick throughout or .5" thick but that weighs not an ounce over 3 lb. Finally, determine that it would be extremely RARE that I would ever need more than a 4-hour battery (I imagine 95% of all Mac notebook users don't need more than a 4-hour battery). Use all of these parameters to give me the ultimate performance possible from this MBA's weight, size/thickness, and required battery results.
Order of priority
1. 2+ GHz CPU (I recommend Core i7-640LM at 2.13 GHz [boost 2.93 GHz])
2. Nvidia 320m or discrete GPU (I recommend ATI 5430 at 7W)
3. 4 GB RAM or two RAM slots (I recommend BTO 8 GB RAM)
4. 256 GB SSD or 160 GB Intel SSD (I recommend Intel 160 GB SSD)
5. IPS HD Display
6. Glass Trackpad
7. USB 3.0/LightPeak
8. Intel Wireless Display Technology
9. Aluminum-capped Keyboard
This is how I would make the MBA. Take the thickness resrictions, weight limitation, and ONLY whatever it takes for a 4-hour battery. Add all of the desired priorities and give us the best MBA possible at 3 lb. with 4-hour battery.
Anyone that wants a 10-hour battery can buy an extended battery that adds another pound and another 1/2" thickness via an external bottom mount battery device. Basically like Dell or Sony or other batteries that are thicker and make entire laptop measure thicker if want extended capabilities. This would just plug into the bottom and add weight and thickness for those who actually want to bog down their MBA with a 10-hour battery when the vast majority of us would never use such an "option."