I have a few doubts. I am not sure if auditioning the speakers inside the dealer shop is a good thing or not as the stock HU has just 30x4W built in amp in contrast to the 50x4W amp in most after market HUs from Pioneer, Alpine, JVC, Kenwood, Clarion and so on. I searched for a lot of components. JBL offers very good components (GT5-S265C) but they have a RMS wattage rating of around 45W with peak rating of 240W. Hertz and MTX are not sold here in Chandigarh as they don't have a service center in this region but I have heard that they work good with the stock head unit.