In North America this is a good month to get a PS3. I don't have one (have a 360) but I may get one down the road, depending on exclusive games. Since I'm not Indian, it's hard for me to say what games will be available there. I looked it up online, but couldn't find much info. Everything seems to go by America, Australia, Europe, and Japan, so it would fall into one of these groups. I'll answer assuming Europe unless someone else knows what schedule Indian games are released by. It depends on what kind of games you like.
Below are some of the best games available with links to reviews (unless they are not out yet). I own Call of Duty 4 and would recommend that if you enjoy shooters (and even if you don't, maybe). It is simply one of the best games ever made, exciting and fun, plus has online element for multi-player.
If you have friends over often and like rock music, Rock Band is incredibly fun! But the game bundle (with instruments) costs 4x what a game normally does.
Uncharted is an Indiana Jones type adventure that has been getting rave reviews, and I'd definitely want that game on PS3. It is also exclusive to PS3. If you play alone this might be the way to go.
Grand Theft Auto IV is coming out this very month and if you enjoy the other games in the series, this one will probably exceed them all. I will probably get this for my 360 next month.
Metal Gear Solid 4 is coming this summer, meaning there will be a wait for it. Still, this is one of the top-anticipated releases on the PS3 (the other being Final Fantasy XIII). I would definitely think this one would be worth getting. I like the Metal Gear games, though Call of Duty 4 has a storyline that has brought the series closer to the depth of MGS.
There are no real good JRPG games available, but if you like American style RPGs, there is Oblivion. I have it for 360 and is one of my favorites.
Ultimately, I'd get CoD4 but if you don't like shooters, I'd probably go for GTAIV or Uncharted. CoD4 is just an amazing game. If you are into RPGs, get Oblivion, especially because you can play the game FOREVER! I've barely scratched the surface on it.
Below are links to help you choose.
Call of Duty 4 (11/9/2007)
http://www.metacritic.com/games/platforms/ps3/callofduty4modernwarfare
http://www.gamefaqs.com/console/ps3/review/939213.html
http://en.wikipedia.org/wiki/Call_of_duty_4
Uncharted Drake's Fortune (12/7/2007)
http://www.metacritic.com/games/platforms/ps3/uncharteddrakesfortune
http://www.gamefaqs.com/console/ps3/review/932984.html
http://en.wikipedia.org/wiki/Uncharted:_Drake%27s_Fortune
Grand Theft Auto IV (4/29/2008)
http://en.wikipedia.org/wiki/Grand_theft_auto_iv
Metal Gear Solid 4 (6/12/2008)
http://en.wikipedia.org/wiki/Metal_Gear_Solid_4
Rock Band (Q3 2008)
http://www.metacritic.com/games/platforms/ps3/rockband
http://www.gamefaqs.com/console/ps3/review/938871.html
http://en.wikipedia.org/wiki/Rock_band_game
Oblivion
http://www.metacritic.com/games/platforms/ps3/elderscrolls4oblivion
http://www.gamefaqs.com/console/ps3/review/934605.html
http://en.wikipedia.org/wiki/The_Elder_Scrolls_IV:_Oblivion
Meta Critic list of game scores
http://www.metacritic.com/games/ps3/scores/
Release dates
http://www.gamefaqs.com/console/ps3/releases.html?limiter=3
http://ps3.ign.com/index/release.html?constraint.eq.game.locale=uk