out o those two i would go for the lpr...
but i do agree it would be overpowered.... i believe that .21 engines are more suitable for buggys.
a great engine is (for a good price) would be [link=http://www.amainhobbies.com/product_info.php/cPath/1_23_31/products_id/16978]this[/link] go tech
u will get much better mileage too
have fun with ur shopping

btw welcome to the forum[sm=cool.gif]