I personally chose to look for an e92 with idrive because i liked the styling better with the "hump" in the dash. Don't really use the nav feature though because it takes too long to type in an address anyway.
imo, its pretty cheesy to have a garmin suction cupped to my windshield.
Car for sale http://www.e90post.com/forums/showthread.php?t=881526
JB4 G5 - Forge FMIC - VRSF V2 DP - Magnaflow 15529 Catback Exhaust - BMS Clutch Stop - BMS DCI - CDV Delete - Dinan Stage 3 Suspension - 19x8.5/10 Forgestar F14 Gloss Gunmetal - Michelin PSS - M-Sport Front & Rear - M3 Side Skirts - OEM M3 Decklid Spoiler - BMW Performance Grilles - ZHP Shift Knob - M-Sport Steering Wheel - M-Sport Door Sills