Digicam - Can you give some pointers?

Am to buy a digicam soon. This review gave a good idea on the subject & may be useful for you too. I've now decided in buying a Canon. Model's a question still - I may go with A400, A510 or A520.

Now the only problem is the varying prices. A520 is availabe for as low as Rs. 12,600 in ebay.in. The same is priced Rs. 17,995 in Canon India's website & Sify.com quotes a price of Rs. 20,395!

Most probably the price difference is due to the latest model, the accessories involved, the warranty periods etc. If any of you are sure of what a good deal is, put it in the comments please.