May be, it will surprise you a bit but, both the Carl Zeiss lenses for Nikon mount and Voigtlander lenses are being made by the same Japanese company – Cosina. Voigtander lenses come in at a close second after Zeiss (supposedly). The quality of these lenses is a huge debate on the internet. Some say these lenses are scam and some say they are far better than proprietary lenses of the same configuration and cost less. So purely on the basis of price I chose three lenses which cost less than $600 each.
1)Voigtlander Ultron 28mm f2 - $559
2)Voigtlander Nokton Classic 40mm f1.4 - $379
3)VoigtlanderNokton Classic 35mm f1.4 - $529