getting an android phone without lag is difficult.. every phone in the range 15-17k gives you the 512 ram which is not sufficient...if you have checked sam's post only 3 phones which have more than 512 ram
1. s adavance -
2. s duos- dual sim phone...
3. attrix -in all the 3 devices moto attrix is the best..but its out of your budget.
attrix is the best device but out of your bodget. galaxy s advance costs 18500/-in local shops...guess it is out of your budget too..
s duos looks like a good alternative to me.
it is accepted hat dual sim needs more battery, but there will not be drastic difference in the battery life.
now, if you listen to your heart... i think you need
htc one v- awesome phone, 3.7' screen, lasts for a day with average 2g usage, overall a good package.. i used for few days ,it doesn't lag ...lags only if you run too many applications together... use some memory managing app for it...
hope this helps