Apple will never catch up with Microsoft, it's just way too late in the game, plus I would never be able to justify in the insane price that Macs sell for, it's just absurd, especially now that they have Intel processors.
Anyhow, I just upgraded to Vista Home Premium, and I'm liking it a lot. There are a couple programs that won't work due to incompatibility, but it's the vendor's fault, not really Microsoft's. It took a long time to get everything you want working on XP when it was first released as well. Anyway, if you want a great deal on Vista Home Premium, go to academicsuperstore.com or any "academic" software website, and buy the upgrade (you need to have a student/teacher ID, or just know someone who does - my sister does, got it for $69). You CAN do a complete full install using the upgrade disc, which I did. Do you google search for "complete vista install using upgrade" or something like that, it's very easy to do, and you can end up saving ~$200.