If gps is important to you, buy a standalone GPS unit.
HU with GPS doesn't come cheap if good, if cheap then mostly have something lacking. Like UI laggy, FM radio problem etc etc~
Anyway Car stereo is never cheap, especially in Malaysia.

quite ok, at least better than stock one. haha
if you have budget, get pioneer~ they are quite good.

Well if you are looking for something cheap,  then head down to Nilai 3, there is one shop that sell 2 din unit that fit in Prevé,  perfectly.  Cost rm895. If you want to add in HD camera add another rm300. Price inclusive of installation.

Whilst I was there I saw they install the unit into one red preve,  and sound is ok,  they also able to map the steering buttons to the Hu.  Sound wise with stock is more then acceptable,  and to my ears better then stock Hu,  most probably due to higher power output from this unit.

GPS uses papago as standard on window ce unit and uses malfree maps,  so You can update the map for free.

They also have the branded unit Kenwood etc. On display.  So you can listen in to differentiate the differences and try out the interface.

Really tempted to put in my preve but as mine still waiting for the auto rain sensor unit repair I will not touch any of stock wiring for the moment.

if you want kenwood, it do have cheaper version.
refer this
https://forum.lowyat.net/topic/3242088/all

If u want change HU then change those gps like Papago, may update the map easily.. Papago map consider very updated and good ui.
Me, end of July car. Version seems latest but map is still outdated.. So don't look forward to spend rm300 for a sd card.. I only use my stock HU as reverse camera viewer, Bluetooth, radio, music and CD player.. Gps I do have my iPad and smartphone.

Unfortunately I do not have the address it is eleven A or something. They have have several shops in nilai 3 itself. I believe this one is the same one if you want to see and contact dealer.
https://forum.lowyat.net/topic/2763287/all

This kind of HU doesn't worth money for me. For me only lah. Haha

good thing doesn't come cheap.
less then 2k you can get mid-range model from branded. mostly doesn't come with 7inch display.
Nakamichi was a very good brand before. You can take it if suit you.

What I know is what you can simply Google, like EA those.
their price usually not cheap. I know one person selling Pioneer    at very low price. But not very dare to approach it.
Besides price of the product, you should also make sure workmanship, later wiring fxxk up, say bye bye to warranty.
I myself wanted to change but price doesn't really satisfy the usage. If I have that budget,might do soundproof or leather seat first.