these great these i av one called an air an it really thin and light and never gets viruses or something cos its better than windos or a least thats what my bro asiad , def buy it!
OSX is absolutely wonderful, im a pretty big fan of it, but it is only "better" than Windows in certain aspects; for the majority, Windows is a much better and user-friendly OS.
You can run Windows on the post-G5 macs (Intel CPU's).