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Where did you see them for 109? I just looked at their site (mustangtuning.com) and it shows Motive on sale for 159.99 and FRPP not on sale for 239.99.
cant go wrong with 4.10's i see your question for the title is wrong should be "4.10's or 4.30's?" .... youll love 4.10's and hate yourself for not going 4.30's
differnce in rpms from 4.10 and 4.30 is around 110 rpms.... so if at 70mph with your t-45 transmission i assume...you will run 2.5k rpms and with 4.30's 2.6k rpms