There is a person by name Mark, runs a company name Stage 99. He is an audiophile. He develops a music exploder, in the form of boxes with the best of sources available and knowledge which he has which has eventually transcended from him father who was an OEM
business-er. Believe me the Audio box gives the best of clarity and bass equally.
He himself will give you suggestion on the head unit (between a Pioneer/ Alpine).
He is reasonable in his quote. You might as well take a Demo before buying.
Additionally this comes at the cost of sacrificing 20% of your rear truck space for the Audio Box, dynamite as we call it.
Two of my friends have done it in their Santro & Dzire, and finding it real good for that last year or so
Mark can be reached at 98410-23957.