Help to choose the right ADC

I'm new about adc, so i need help to choose the right ADC....
i have this signal:
1)signal bandwidth=0-4KHz ==>8ksps min
2)noise free resolution=14bit
other parameters:
1)number of channels:1
2)Vdd=3.3V (preferably)
I'm oriented on sigma-delta adc, but i haven't found adc with this
parameters...Also a sar adc coud be a good choice, but in this case a
greater sps is necessary (i think) to obtain a simple antialiasing
filter....can you help me?
Thanks in advance
.