If you are considering to buy a mac, The answer is YES. It is pricey, but worth every cent and you will love it, what so ever. It is virus free, more secure, very fast, extremely stable and stylish.
Alright, now that you have decided to buy a mac (not convinced still?), you have to decide where to buy a mac!!
The first and foremost place to buy is the apple store. You can customize your mac and also get free shipping, but you end up paying tax.
The next best option would be buy it at amazon, you do not get a chance to personalize your mac, but you can save on the tax. Buying a mac at amazon has its own advantages.
I do not trust ebay as a good place to buy a mac, unless you are pretty sure about the requirements and trust the seller.
You could also buy at macmall, it is a very good site to buy a mac.