You heard it wrong. If you're going with the iphones, its best to buy the factory unlocked ones (though expensive). They can be upgraded to any later compatible iOS.
But again:
3GS Factory Unlocked 16GB: 31 to 35k
HTC Desire (Much more powerful): 27k
Watch this tiny video review.
YouTube - HTC Desire vs. iPhone 3G S Review - by Gazelle.com
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