alright, first welcome to zilvia.
2nd, use the search button in between the quick links and new post buttons. if you ask these questions without searching... god help you. you will get your @$$ handed to you. Y? u ask? because this question has been answered a million times and people get sick of them.
3rd, its cheap. get ti. being stock and an auto is not something you can't change.
4th, the rb26 setup is not cheap. lots of modding so lots of $$$$ hope you got that kinda dough. especially if you can't do it yourself.
5th, you can make a lot of power with the sr if you build it right.
6th, ask your self " what is my goal for the car?" answer that and you might find that you can even go the ka-t route.
peace
o btw to stay on topic
http://www.mckinneymotorsports.com/products
have fun!