On most Dubai roads I've seen while visiting there you may not get punished too much with the 20 inches but 1M is too compact for 20 inches imho. Stick with stocks, get them painted maybe?
Or if around 8K USD is not a problem, consider HRE S 101:
http://blog.titanmotorsports.com/?p=4054
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"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
BMW 1M-SOLD-: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake.