Like Zak said, I'd also do it in 2 stages if the current budget is 10K.
HU + fronts now. Rears next.
If you're doing everything now,
HU: Pio 4950: 5K
Fronts: JBL GTO 607c (6.5" 2-way comps): 6500/- OR GTO 507c (5.25" 2-way comps): 5500/- (Depending on what the Estilo takes in front). If its like the Wagon R, you'll be able to get only 4" co-axes in front. Then it would be the GTO 427: 2700/-.
Rears: Since you have no sub, get 6x9s. JBL GTO937: 4900/-
Unless you have definite plans for an amp and sub later, you can settle for 2 pre-outs in the HU. If you're not at all likely to go for amps and subs, one pre-out will do.
@Manikjeet, what size does the Estilo take in front? Is the stock provision on the dash or on the doors? Does it have stock provision for speakers in back?
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