I'm looking for a good racing flat that is light but enough to hold up to a possible marathon. i've run the brooks racer st but didn't really like them. i've got a pair of adidas adizero pro's that are neutral and not 'enough of a shoe' to run a marathon in. i've tried on the saucony fastwitch but it seems pretty minimal as well. from what i can tell, the asics bandito is another option but not sure how it compares to some of those others. i train in lightweight trainers (ds trainer, nb 902) and want something a little more 'racey.' any thoughts??