Just throwing in my two bits worth from down under.

I've had several PCs, and 6 months ago bought an iMac for website design.
I've also used wireless broadband for a few years, now, and use it on the Mac.
Once you have owned a Mac, it is very hard to go back to a PC.
The browser that comes with a Mac, Safari, is streets ahead of Microsoft, even tho they tried to catch up with IE8, which hasn't met expectations.
And the operating system, Snow Leopard', is great, too. Far ahead of MS. But there are other operating systems, like Linux, which are excellent.
Viruses are virtually non-existent on a Mac.
Prices are 'fixed', with Macs, but somtimes they allow retailers to discount a little.
The Mac laptop you mentioned is fairly low in specs, compared with a PC you could now get for much less money.
New PC laptops are far cheaper, and do the job. The best deal on a PC is usually the cheapest.
I bought a new Dell 17" PC laptop recently, and it is really good for the price.
Remember, they become obsolete so fast that people nowadays replace them before they have major problems. I know I do, it's much less hassle and repairs are hardly worth while.
It does take a while to get to know how to use a Mac, despite all the assurances of the retailers. But it's worth it.
They're not complicated. Just different.
Firefox for Mac or PC is great. Personally, I prefer Apple's Safari for internet work. It's also noticeably faster than PC based browsers.
Comes down to: do you want to spend more and get a Mac for peace of mind? I think it's worth it, but it's a personal thing.
I'm having hassles right now with IE8, so hope I can post this.
Any other questions .. PM me if you like.
Hey, we really need a PC thread on BM.
Cheers, Rob,