The Rider, like the Elixir, is a neutral show so that matches - but will be heavier. The closets match to the old elixir are now the Hitogami or the Sayonara. Both neutral & light, but the sayonara will have a bit more cusioning and is a better day to day light weight trainer, whilst the hitogami is more of a fast paced traner or race trainer. Considering you 'light frame' and daily running i'd go with the sayonara as the safer choice.
mizuno make some great traners, but their website doesn't always keep up with their own shoes so not ideal!