well look, you come to a mac site and ask which to buy, we're going to tell you to get the mac, obviously. The reason most of us are here is because we really like macs, and usually prefer them to PCs.
That said...
I would not like that little notebook. Unless you are carrying it around all day every day, and you're very bothered by carrying extra stuff, I don't see why anyone would get a 10.6 in. computer. I have a 12" PB, and it's so amazingly portable that I just can't imagine needing anything smaller/ lighter. And looking at a 10.6" screen all the time... I couldn't stand it. I'm going to get an external display because I even get tired of this 12" display. 10.6" would be much worse - too horrible for more than occasional use, IMO.
PC vs. Mac aside, I just don't like 10.6" notebooks, and don't see a need for them. I know some people want apple to make one, but I think the 12" PB or ibook (or 12" PC notebook, if that's what you like) is plenty small enough.
btw, I don't see where the previous poster got $2000. These notebooks aren't that expensive... neither are the 12" apple portables, though.