I went with the 12" and a 20" widescreen LCD for the price of a 15". Pasting from another post I made in a similar thread:
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I was confronted with this decision just recently. As I was lurking in this forum and contemplating switching, I had my eyes set on a 15" and didn't even consider the 12" for being too small. To my surprise, I ended up getting a 12" and couldn't be happier.
How come? I sat down and imagined how I would use it. I mainly do three things: day-to-day stuff such as browsing, email, IM, music etc; then coding and, finally, photo post-processing in Photoshop.
For day-to-day activities the screen size doesn't really matter that much. For coding, it's not too much of a factor however it would be nice to have more screen estate at times. For photos I knew for sure I wanted a widescreen to better fit the Photoshop palettes to the side. I also wanted a larger screen since the images I typically edit are 4800x3200 pixels in size . This was the turning point when I realized that the 15" alone won't cut it for what I need. Kind of a jack of all trades, master of none.
Again, this is for *my own* requirements. The 15" is probably the ticket if the built in display is all one ever needs.
So that's how I ended up going with the most unlikely candidate, the 12" PB. I took a test drive at the Apple Store and then ordered one right after Tiger was announced while taking advantage of the Amazon rebate. With the money I saved over the 15" I bought a 20" widescreen Dell LCD, an Apple wireless keyboard and mouse and a Booq Powersleeve.
I am very happy with this setup since it fits me just right. The 12" excels at portability and battery life. This helps me do my day-to-day stuff and light coding from wherever, be it coffee table in front of the tv, couch, bedroom, coffee shop etc. When I need more screen estate, for eg. while editing photos, I simply move to my computer desk and hook it up to the 20" widescreen LCD. I also have the old Windows tower PC hooked up to the VGA input of the LCD, bypassing buying a KVM, and soon will add the TiVo to the S-video one.
I don't miss the Gigabit ethernet or the Firewire 800 a bit. However, if this will be your only machine, I seriously recommend getting the Superdrive. I cut corners and got the combo since I have a new dual-layer burner in a fast Windows tower that is now relegated to large RAID1 network storage device and DVD burning. I upgraded the RAM to 1.25 GB with a third party stick and got a Booq Powersleeve 12" for housing.
Before taking delivery I was worried about the screen size. I never used anything so small before. After two weeks, I know I made the right choice and would pick the same combination all over again. I suggest you spend some time evaluating your usage patterns and figure out what you think would work best for you without giving too much weight to specifications alone. Good luck
Edited to show math:
12" PB from Amazon: $1350 after rebate
Dell 2005FPW: $342
Apple wireless keyboard and mouse: $106 after 10% price reduction during Tiger launch
1GB RAM from Newegg: $135
Booq Powersleeve 12": $42
Tiger Up-To-Date: $10
Grand Total: $1985 for a complete setup
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If you want to go above 1 GB of RAM I recommend getting
this 1 GB stick for $135. Incidentally, it's on sale for $129.99 until 5:30 PDT today. Read the reviews on it, there are lots of Powerbook owners there that bought it, like myself, and were happy.