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I am not familiar with the songs from Lekin (except Yara seeli seeli..), Rudaali and Ijazat, so can't comment.
May I recommend, which you'd know, two absolutely himalayan numbers from Dastak, composed by Lata's favourite Madan bhaiyya, penned by one of my favourites - the Unani doctor from Lucknow - Asrar -ul- Hassan Khan aka Majrooh* :
1. Baiyan na dharo -Lata
2. Mairi ri mein kaase kahun - Lata
The latter was re-released later with Madan Mohan's voice included ( Lata was unwell at some stage in the recording and Madan Mohan had hummed it). Incidentally Madan Mohan is an old boy of St. Mary's Byculla.
* Majrooh is believed to be the person who recommended RDB to its director Nasir Hussain for his significant break in the trend setting Teesri Manzil (the story of how Shammi K overwhelmed RDB during the 'selection' process is another story)
Also, you might like to listen to :
Duniya o duniya, lyrics by Anand Bakshi, music by SD, from the film Naya Zamana. Another introspective gem.
It has another racy number from (surprise) Lata - Rama rama gajab hui gawaari.
Exceptional music.
Regards, enjoy