Any of the Lava Isles are where you can find obsidian chunks. There is no "best" place. Also, sometimes you can find them in the rock shops if another player has sold them recently.
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Minecraft.net is the best place.
the best place is to go to www.free psp wallpapers.com
The best place to train typhlosion is Route 26 in The Kanto regoin.
The best place I know is victory road
No, the best place to find diamonds are on level 10-15.