Hifi sound system upgrade.... what to do

[Peteygasp]

Looking for a great HiFi sound system upgrade.. for my 2012 e70

Heard mixed reviews about the BAV sound upgrade, and am really looking for some nice CRISP audio (nice crisp sounding highs, great lows, and deep bass, etc.)...so I don't think that is going to cut it.

I am from Long Island NY so if any of you guys have any experience with a sound upgrade from the Hi-Fi system (not base or premium) system, and have a good recommendation for installation, let me know please!

I am a complete amateur here with this subject so I have no clue what I need to do or what it should range in price with installation, have no idea about amps, tweeters, etc... but have seen these all over during my research on the topic..

Looking to spend around $1,000 total, can go a little higher depending on the expense to value ratio here..

Thanks a lot in advance for all of your inputs... and happy thanksgiving to all