Try to get a branded HU, rather than OEM players such as this (http://www.mudah.my/Persona+Gen2+Oem+Double+Din+Monitor+USB-22009771.htm) that I installed, while feature packed and cheaper of cos, does not have a good sound quality unless you can get a mid to high end amp to go with it.

Check http://paultan.org/2013/01/21/pioneer-laun...-vw-polo-camry/ out for some pioneer models released this year. (Btw, this guy also selling it - https://forum.lowyat.net/topic/2500717). Cheapest is the lowest range PIONEER AVH-X1550DVD. Don't know whether include camera, and installation fee?

With you budget just upgrade your HU first. Then go for insulation (door+bonnet+boot) then only think of upgrading your speakers. If you really want, just add a tweeter with your HU. Finally amp and woofer if you want some serious bass.

I know earlier Gen2 are really noisy, how is the CPS? As quiet as a Persona or not?