If you only went to 1 dealer, then no, it's not the best deal you can get. Have them fight each other's prices. For reference, I got $3625 off MSRP after talking to 4 dealerships on a 3.0si with less options than you.

As a matter of fact, one dealer (thru internet sales) stated straight up - we always do $1500 over invoice. That was just about my -$3625 figure but another dealer said they'd beat it by $200.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr