The only way you can really know what you want is by listening to all 3... I have an Akra full system... but this is what "I" wanted, but it may not be to your liking sound wise. What I can tell you about the Akra is that you will not find a better crafted system on the market... the workmanship is flawless. Oh... the only bad thing is the Akra is very pricey
There are alot more systems you can try out.... eissmans are good but too loud for me.
I have not heard a Gintani so I cannot comment, but there are alot of guys on here that like them so maybe there is someone with one near by you that will take you for a ride.
Personally I wouldnt go for the BMWP as its a little tame.
Do your research and im sure you will find what you want.