SB yeh aapko kya ho gaya??
Ham the jinke sahare is also a sad song!! So also Kahin tau milegi doesn't fit the "newly wed" mood!
Soft romantic main yeh kaise aa gaye bhala?? Preet I assume SB has read you right and you are looking for some soft romantic songs... tau yeh list of my favorite Lata solos dekho - mood - I am in love / pehla nasha pehla khumar kinds

And yes, I second songs 2 & 3 from SB's list.
Neend Kabhi Rahti Thi Aankhon Mein, Aasra
Tere Bina Jiya Jaaye Na and Aaj Kal Paon Zameen Par Nahin Padte Mere
, Ghar
O Suno Suno Suno Ji More Rasiya, Jhanak Jhanak Payal Baje
Sakhi Ri Pee Ka Naam Naam Na Poochho & Jeevan Dor Tumhi Sang Bandhi,
Sati Savitri
Apne Piya Ki Prem Pujaran, Aman
Unki Pehli Nazar Kya Asar Kar Gayi, April Fool
Jogi Jabse Tu Aaya Mere Dware, Bandini
Tere Khayalon Mein Tere Hi Khwabon Mein, Meri Soorat Teri Aankhen
Bheeni Bheeni Hain Meethi Meethi Hain, Nausherwan E Adil
Baghon Mein Baharon Ithlata Gaata Aaya Koyi, Chhoti Bahen (with chorus)
Man Dole Mera Tan Dole Mere Dil Ka Gaya Qarar, Nagin
Nainon Mein Pyar Dole, Sheroo
Bahar Banke Woh Muskuraye, Apne Huye Paraye
Tera Mera Saath Rahe, Saudagar
Bahon Mein Chale Aao, Anamika (a little more inviting perhaps)
Chalo Sajna Jahan Tak Ghata Chale, Mere Humdam Mere Dost
Dhadka Hai Dil Mein Pyar, Jaal
Dil Ka Diya Jalake Gaya, Akashdeep
Jaane Kaise Sapnon Mein Kho Gayi Ankhiyan, Anuradha
Kya Janoo Sajan Hoti Hain Kya Gham Ki Sham, Baharon Ke Sapne
Na Jane Kya Hua Jo Tune Chhu Liya, Dard
Roz Shaam Aati Thi, Imtihaan
Meri Ankhon Se Koi Neend, Pooja Ke Phool
Tadap Yeh Din Raat Ki & Tumhe Yaad Karte Kart, Amrapali
O Ghata Sanwari & Sajna O Sajna, Abhinetri
Yeh Jabse Huyi Jiya Ki Chori, Us Paar
and of course Dil Unko Utha Ke De Diya, Baap Bete (but I doubt anyone has a CDable copy of this one)
Now tell me which of these you like and I'll try to find more along those lines...
... and yes SB... Ira Nagrath it is!!!