If it is coaxials for all speakers no need of an amp. Component speakers and subwoofers are there in the setup then amplifier is recommended to get the best out of them. Suggested a 4 channel amp for you because you can use 2 channels for the front component speakers now and keep the other two for the subwoofer, which shall be added later.
Well,I think i should get a component speakers at front and coaxial at rear.As many are going same combo.But the polk audio is too pricey locally..
Any other suggestion for Component speakers ? And also mention few good Sub woofer also,if budget permits i'll get one :p
Also check the 2790BT have the wireless remote control with it in the box, if you think remote is a must have. because the spec says "Wired remote control" (I think even the JVC HU have only "remote ready").
Even though 2790bt is old but it has all features that the latest HU have and it also supports mkv and mp4, Apple and android,mirror link and rest features yet to learn
Wired or wireless remote is not a concern,as we can easily access the touch screen..
List as of now :
Pioneer AVH - X2790BT or similar one or probably low price one.
Jbl coaxial for rear
Amp
And also, He said good quality wire priced at 1650 and Branded rear cam for 1450rs
And for GPS i'll go with Garmin later as they provide free updates.Local price is 10k
MMI is 6k