Originally posted by Jetsam1
My Macbook is coming up to 3 years old now, got it and the K200 at roughly the same time. It's a 13" screen and I would like a bigger one. My old desktop is starting to fail a bit now even with Linux.........
I should say that I have only ever owned or used the one digital SLR camera so my knowledge of other Pentax models or any other brand to use is very limited! I was asking this question as there are people on here with much more camera experience than me that I thought it would be advantageous to investigate.
An idea (you can have it all

).
The computer is 3 years old - which means it's a dual core and likely very zippy for most applications (lightroom/aperture, the office suite etc.) Are you stressing your machine with complicated MATLAB scripts? If you aren't and don't use the thing for video games, I would wait on the computer.
If you find things get sluggish with a lot of things open at once, you could upgrade your ram to 2 or 4 GBs, which would run you about 100 bucks (NB: never buy ram from Apple. They charge at least 2X the going rate on RAM).
In the interm, I would buy an external monitor. Investing in laptop screens is sort of a silly venture because they go with the computer, when in reality, they should live far longer than the computer's components. LCD tech is not advancing nearly fast enough to warrant a new screen every 3 years. When you buy a 15 + inch laptop with a good screen, a lot of that money (not to mention battery life!) goes into the the screen.
Furthermore, a 13 inch laptop with an external has the advatage of desktop real estate when you need it, and portability when you need it. Your back will thank you.
Now, instead of spending 1500-2000 dollars, you are spending, tops, 500. A good screen is an investment (and you don't need an Apple cinema display, either).
And for an extra 500 dollars, you could upgrade to the K-X which will get you a few stops of high ISO. Body only is about 500 bucks. Hell, you could spend the last 500 dollars on a shiny new lens, or maybe skip on the K-X and wait until the K-5 sells for 1000. I don't think the K200d is a slouch at all... rather a very nice camera.