Hey, I'm starting on my first carpc install project as well. I've gotten most of the parts together and I decided on the one from CarTFT...the TMR one not the transreflective. With shipping the total came up to around $560 CDN. So far I'm happy with the screen but I have not installed everything as yet.
I have an E46 as well so it'll be going in the same car....hopefully within the next couple of weeks when more parts arrive.