true mb quarts are made in germany, what i meant to say is that a/d/s/ is a company founded by bmw enthusiasts who develop their products in bmw's. a/d/s/ even has bmw specific application manuals for their products.
here is a link for the e39 upgrade manual:
www.adst.com/pdfs/bmwe39.pdf
here is evosport's a/d/s pricelist to get an idea of prices:
www.evosport.com/product/mobile_elec/
focals are great speakers, i would personally vote dynaudio on par with focal. i have run a full focal set up and a full dynaudio set up and i prefer the dyns. they are a little warmer and work well with my mcintosh labs mx406 source and mcc404 amplifiers. focals subs are much better than dyns subs. i am currently running 2 alumapro alchemy 12s with dyns for front a rear stages in my suv, a great SQ set up. my 3er has a complete a/d/s/ set up, speakers, subs, amps, with a denon dct-z1 source. in the end speaker and electronics selection is all about preference, i would recommend auditioning, along with mb quart, focal, a/d/s/, and dynaudio, to see what is out there.
also, if you wanted to get silly spending money on mobile speakers you could go with another german brand, RS Sound, they run about 4k for a pair or BRAX, whose speakers run about 3k a pair.