I would like to buy a canon camera with min 12 x optical zoom and 8mp. Also i would like to have telezoom?

Can any one tell me which model should i go for and where to buy it in india? also this camera should support wide angle lens and filters.

The Canon PowerShot is an excellent camera, however there are others equally as good.
Sony Cyber-shot DSC-H2. 12X optical zoom, 6 megapixels, image stabilizer, comes with battery charger, 1 sec delay between shots.
Fujifilm FinePix S5200. 10X optical zoom, 5 megapixels.
Canon PowerShot S2 IS. 12X optical zoom, 5 megapixels.
The 3 I mentioned will give you an excellent 8X10 print.I myself would shop by price. Very little difference among the three.

Try going to the Canon website. Look at the Powershot S5...I have the S3 and love it with it's 12X zoom!

Don't exist. For interchangable lenses the zoom range drops to maybe 5:1 you only get big zoom ranges in fixed lens cameras.

You need to check out the Canon Rebel XT and the Canon S3 and compare them.

There's a big price difference too!

Well, the Canon Powershot S5 IS fits all your specs.
Although, the camera won't support filters. You will need to buy a dSLR for that. They start at around $599 CAD.

Also, if you're open to other brands, there is the Olympus SP 550-UZ, and it has 18x zoom.