Personally I would go with the Forgestar, more sizes available and custom offsets. I would go with at least ZCP sizes of 19x9 and 19x10, which the Vossen don't even offer unless you go with 20s. I don't like dubs on a M3...just my .02.
2011 M3 Coupe-MR/Blk Turner Test Pipes, AFE pulley, Megan Catback/AFE Stg.2. 255/285 tires.
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk