The E7 or the N700A would work nice as the middle piece colour scheme wise. I love the E5 X 500 jingle. I like that it's a mix of the E5 and 500 jingles, they mix well together
* hears what you said about jrx from car robots and not knowing his japanese name off hand * well he does kinda look like who i remember to be rapid run but i wouldn't know i tried when the series was new to get rail racer but was only able to get midnight express so don't have it on hand to check