Hi buddy 
Sorry for the late reply, kinda busy in exams
The 3g thing is long term concept i.e. if you gonna use this mobile for more than 1 year. 3g is going to be mainstream in next 1 year (that's what I think).
3g is great but current data plans are not. They are freakin' pricy. I hope they will be more budget friendly after sometime.
So if you gonna use this phone for like more than 1 year than increase your budget, its worth it.
Retailer is right about 3g but wrong about samsung and nokia comparison. Nokia was better than samsung, but its history now. Samsung battery life is nice and most of all it provide the USB charging, which IMO is life saver.
Of all the phone he suggested cedar is best. Other samsung phones are 3g UMTS (385 kbps) but cedar is 3g HSDPA (7.2 mbps). 3g phones without HSDPA are no better than 2g phones with EDGE. I think you got my point

Sorry for the late reply, kinda busy in exams
The 3g thing is long term concept i.e. if you gonna use this mobile for more than 1 year. 3g is going to be mainstream in next 1 year (that's what I think).
3g is great but current data plans are not. They are freakin' pricy. I hope they will be more budget friendly after sometime.
So if you gonna use this phone for like more than 1 year than increase your budget, its worth it.
Retailer is right about 3g but wrong about samsung and nokia comparison. Nokia was better than samsung, but its history now. Samsung battery life is nice and most of all it provide the USB charging, which IMO is life saver.
Of all the phone he suggested cedar is best. Other samsung phones are 3g UMTS (385 kbps) but cedar is 3g HSDPA (7.2 mbps). 3g phones without HSDPA are no better than 2g phones with EDGE. I think you got my point