I’ll jump in on the pragmatic end. I’ve been configuring Macs and PCs for nonprofits, educational institutions, and government organizations and I can state with confidence the only way you can get a $1000 price difference between a Mac and PC is if you are comparing lowend PC with a highend Mac. The price differentials, haven’t been that much for years. Literally, more than 6 years. Maybe if you go for high end, when prices from both vendors are over $3,500. But I’m going to assume your nonprofit isn’t going for that.
An Inspiron class Dell is NOT comparable to a iMac, the Vostra class is barely comparable. The Optiplex class is what you’d want for real comparisons, instead of paper fallacies. That said, to make its somewhat comparable, if you take your lowest model at Dell, the INSPIRON 530 starting at ~$300. To make it comparable to the lowest model iMac, you will need to: Upgrade processor to the Intel Core Duo, so add ~$200; you can keep Vista or pay an extra $150 for the more familiar and reliable XP; modify 1 year limited warranty to at least 3yrs add ~$200 (the hardware’s crap and prone to breakdowns, you want the extra warranty, force it to 4yrs if possible; a basic 20” monitor, add $200. Depending on if you went for Vista or XP your cost is between $900-$1100 (estimation for tax, etc.) versus $1,199 for no modification on the iMac.
If you go with the educational class Dell’s the Optiplex line (much better hardware and support options), the differences aren’t even noticeable. The iMac coming out ahead in a number of categories, versus $50 or $100 wins by Dell in some of the prime standard configurations. And that’s all assuming, the web master wouldn’t have been fine on a Mac mini and a cheap but adequate monitor. Even the business class Vostro’s configure in at around $1,140 and with minor upgrades, free add ons, etc, that Macs them comparable to the 20” iMac at either $1,199 or $1,499.
Also a thing to note, is across almost every client type we’ve worked with, when comparing a Mac to a PC the tendency is to compare base costs. This PC will cost me $279 or $400 as opposed to the end receipt. The $279 base becomes a $900 machine and the owner still says they got it for $279. But unless they are going into a store and picking a machine up off the shelf, very few people buy the machine as is. At the very least, they acknowledge that they need a better warranty.
But really then cost of downtime and support need to be added at some point. Clients never do, but since half of our income comes from PC support, I can tell you its significant. Also the type of support is different as well. With PCs we support the machines, and somewhat the people. Our goals, rapidly become about keeping the client operating today. With Mac clients, we support the people, and the client’s mission/vision. Our goals become helping them envision where they want to be 3, 5, or 10 years from now and creative ways for them to get there.