The "total" may be a blessing in disguise. Depending on the insurance company, they may re-imburse at a higher value than Kelly Blue Book, and certainly higher than anything a used E53 would fetch in a private sale in this economy.

My mom got a great deal from the GEICO adjuster when they declared a "total" on her 1999 Camry V6. Don't remeber the exact $$ but it was about 30% higher than Blue Book.

On the other hand, if they low-ball you, you can always challenge them and keep pestering until they meet your price point. Good luck Rasta!