Not the cheapest solution out there but from what you are describing as needs/requirements you might want to consider the stock BMW performance exhaust (aprox. 1750$ from Tisher). Sorry I don't have any pics, videos or personnal experience but from the description of what you are looking for maybe this will do!
Past experience with Borla is that they do not make the loudest systems but I hear you for your droning fears!
G/L
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'12 B8 S4 Ice Silver on Black/Premium/DSG/Sport Diff/Nav/Carbon Inlays/19' Titanium Wheels/RS4 Grill/AWE exhaust/Alu Kreuz/H&R OE/Pagid RS19
'13 F30 328xi Sapphire Black/Coral Red/Sportline/gloss black with matte red/Style 397 18" wheels
gone: '07 E90 335i, Alpine White/Black with aluminum/sport/ steptronic/paddles/premium/Logic7
gone: '06 E61 530xi Sapphire Black/Black with aluminum/premium/panoramic sunroof/Logic7/PDC
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