Welcome to the forum, shashaxk
Selection of motors solely depends upon your Estimated All Up Weight (AUW) and Motor to motor distance.
And 4 in 1 ESC is cheaper than individual ESCs by few 100 bucks . But once a ESC fails beyond repair in a Quattro ESC , you have to change the whole set - which is costly . Still Quattro ESC is cheaper - and allows a tidy Installation .
If you post your required payload, estimated AUW , Endurance, and Motor to motor distance , I can suggest good Motor - Prop - LiPo combinations
If you are tight on budget, why don't you go for any of those quadcopter kits from rcmumbai, or quadkopters ?