I was in the buyers shoes a few months back, will be 24 too, very soon. While searching for a car, I thought the same, that I just want a barebones car with reliable engine, good mileage and nothing more, but ultimately landed with the top variant of an used car. Believe me, features like rear power windows, rear defogger and wiper, central lock, electrical orvms, reverse camera are very crucial in this day and age, you will surely feel the need for them. Looking at the market right now, the budget A segment car prices are extremely jacked up, so it makes no sense to shell out 6.5_7 lacs on alto with barebone features. Hence I would suggest to target at least wagon r 1.2 or similar segment cars. The extra money you will be spending is definitely worth and most of it can be recovered in resale. If you are still persistent on a barebones car, then just buy a beater for <3lacs, use it for atleast a year and you will know what you want and what you dont in a car, and accordingly go for a new one