You need to do more research. The connector is a measly $29. http://store.apple.com/us/product/MC552ZM/A
That device is also requires app support, numerous reviews on that page say it doesn't mirror output and doesn't work for a number of apps. Your presentation might not go that well after all, unless of course you only use Keynote and Videos for your presentations; or jailbreak the phone to enable mirroring...
Superfetch is a huge part of the perception that Vista is a 'resource pig'. It loads your RAM with commonly accessed files when there is nothing else to do with it, in theory that ram can be cleared as soon as something you're running actually needs it so there is no performance loss in preloading.
I've been running Vista for around 18 months on a relatively inexpensive machine as well and the only complaint I have with it is that it is still far slower for gaming than XP would be.
Support bacteria -- it's the only culture some people have!