I listen to orchestral music too. Bearing in Qualia's comment above, yr 12 Watts, and Mechans' astute ideas, I would caution you that a 90db spl rating is hardly enough; ~100 is more the ticket. So, Mechans gives excellent pointers.
OTOH, why not consider diy?? Check out the Fostex site and/or melhuish's site (the first is .com the other .org).
OTOH, why not consider diy?? Check out the Fostex site and/or melhuish's site (the first is .com the other .org).