Don't ask for a specific room number. If that room is unavailable, the CM assigning the room will not know where to put you, as he/she will not know WHY you wanted that particular room.
What do you want to see? The fireworks at MK? Some trees? The parking lot?
If you want a great view of the MK fireworks, ask for ANY room on the sixth floor, from numbers 6030-6604. Avoid the standard rooms that end in 70-99; these are the ones directly above the Whispering Canyon Cafe. From 7am-10pm, it is VERY loud. We were in a honeymoon suite on the 7th floor directly above the WCC and this was my ONLY complaint about our room on that trip.
I just stayed in standard room 6056. It was PERFECT! We watched the MK fireworks from our beds 2 nights.

We were not bothered at all by the noise from the "service area". If you open your balcony door, you will hear cars, trucks, etc. But once you close it, it's pretty soundproof. You WILL, however, hear the boat horns as they go over that bridge that connects SSL to Bay Lake. A couple nights, during the EMH and Pirates and Princess Parties, when the Mk was open until 1am, we were hearing boats until almost 2:30am...BRING EARPLUGS!!!