Kenwood highest specification for single din was around 400 I think in brothers kelana jaya.. but don't install there lah... if pioneer sure gonna cost you a bomb tho

It's not about buying too expensive player but a lot of factors need to be considered as well... speakers.. wiring and etc.. your cost may go higher then...

if u step into 80prs, u are into the high end ICE category already, although there are even higher end ones... if u get into this range, be prepare to spend more on other components if u want to make sure there is no bottleneck performance in ur setup. amps, wiring, components need to match the level of the 80prs performance capabilities or else it's not really worth it. using high end HU but entry level components and amps will not do justice for the 80prs. u will of cuz get nice sound using the high end HU, but the HU is unable to unleash it's full potential due to other entry level components. Just my opinion. More experienced sifus can correct me if I'm wrong. I'm still learning here. 

active sub! boot active sub or underseat sub? envy cars with super big boot space  y the rear door speaker? front should be the first to be upgraded unless u want ur rear passengers to enjoy quality music first  if rear vs HU, I'd personally go for HU first. Front wise a better option would be component speakers for better soundstage. Just my 2 cents.

well alot of people love boom boom sub  for me quality bass matters more than quantity bass... I think it really depends on the type of subwoofers... high quality subwoofers do produces a really good bass, undistorted while being able to produce deep low bass at high volumes. Usually that type of subwoofer needs a high powered monoblock amp to work. what model of undersub are you using?

this version? http://www.mudah.my/ORIGINAL+MB+QUART+8+Ac...52-46201683.htm my priority for now is an amp and further sound deaden my doors. underseat sub perhaps later on