So I picked up a 2010 Camry last week. Base model everything and the stereo is obviously crap.
For my HU, I'm pretty certain I'll get the Pioneer AVH-X5500BHS.
For amps, I already have a Sundown SAX-100.4 (old school from 5+ years ago) and Elemental Designs Nine.1 (3+ years old)
Sub is an Icon 10" in a small sealed box. (couple years old, but hasn't been used much)
The stock speakers are all 6x9's.
I'd make door plates up front to run 6.5 components, tweeters would either be down in the doors or up on the dash or A-pillar somewhere.
Unsure what to do with the rears since I know it screws up staging and in the pass I'd normally just remove them all together. This time I would like something to be back there since I carpool and we all listen to the funny talk radio in the morning.
$250 would probably be a reasonable amount to spend on the front components. My amp isn't super powerful, just 100x4 at 2ohms and 150x4 at 2 ohms. I guess I could bridge it to 300x2 at 4 ohms if I power the rear speakers off the deck.