There are a couple of things that might help you out in your search.
Is price a factor?
Are you racing at a large or small track?
Are you traveling to different tracks?
Is tuning an issue for you?
Are parts available to you or are you ordering online?
Are you a new driver to 1/8th?
Do you care if it is legal or not? The best deals are in the .26 motors @ $130.
Do you have a selection of pipes or are you going to need one of those too?
Food for thought.
<------ Not done yet.