1: There is no space in the back for luggage in cultus thats why enough space in for the boot. in santro you have enough space for luggage as well. thats why santro for family and cultus for office, though we have santros+cultus in our office and my colony where green number plate santro can be seen everywhere in Islamabad/Rawalpindi. and one thing more cultus is meant for office look it suzuki website and you will realise that this car is mainly targeted for offices. while santro for families.
2:I don't agree that any santro is much expensive in repairs than cultus, if you go to 3s dealers then even cultus is much expensive, and if you go to local shops, and chinese parts as every suzuki owner claim its cheap is also cheap for every other non-suzuki parts. i have purchased the steering rubber boot for Rs. 75 from Fahad autos near ABL chorr chowk Rawalpindi, my friend bought for Rs. 75 same price from the same shop for his Mehran. if you want prove i will give the shop number and ask yourself. for karrh karrh noises, i think every Pak made car will do that, though santro is made from almost 70% imported parts. Suzuki is almost Pakistani made.
3:If you drive any sedan car Like corrolla and Honda you will feel height like santro, but in cultus, alto. mehran you will feel like more near to earth. it is personal preference what hight you choose, i personally like the hight and position of the steering of santro. also like by females 
4: Yes it is given to +55 years old manager in our organization, agree with you, because they memorize the era of khyber while sitting in Cultus, Unko apni Jawani yad ati hy es ko daikh daikh kar. 
Thats why major organization keep their employees will trained and satisfied to enhance production. :o
Thank you all
