For sure get the M-Sport (unless it comes standard for 2013). For the looks, comfort, and resale it is a no brainer...
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08 135i |Alpine White w/ Terra Boston Leather|Sport Pkg| Premium Pkg| Shadowline| Gloss Black Trim| Nav| Comfort Access| Active Steering| Steptronic| Htd Seats| Prem. Sound/Sirius| Park Distance| PPK 1|BMS 4LED|M3 Sway Bar
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