@Arjunbhargwa, For a single din buy any HU with 3RCA pre-outs (preferable hi volt of 4 or 5V or more). JVC makes some VFM HUs that meet these criteria. For sub a single 10" Pioneer champion pro or an Infinity Kappa 10". For front components a pair of morel maximo 6.5" (totally worth the money) and co-axials for rear of the same brand preferably. You can add the rear co-axials later if budget shoots up.