Wow, how did i miss this thread? it even has my name on it.
I really can't answer this any better than christian did. so i am just going to expound a few points.
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Buying a kit, engine, radio, ect seperately is a much better way to go, but will also be more costly when u start out. If you can afford it, go with a kit, and build it yourself, not only will u have the experience of building your kit , once done, but u will know it inside and out when it breaks. it will break. u can also pick your own engine, your own radio, ect.....
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For any LHS to talk poorly about the RC10GT shows an utter lack of knowlege. Not only is it the longest running rc car in existance, but it has one more championships than any other in the world!
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To answer your question regarding the OS mill, i personally think they are the best engines on the planet. And the .12 cv wil only be a lil more powerful than the stock AE mill, but MUCH more reliable, and very easy to tune. If you can afford it, go with the cv-r series. they produce double the power of the cv series, and if its too much, just dont squeeze the go trigger too hard.
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As for prices - the RTR version can be had anywhere for about 300.00 after u get all ur support equip, such as fuel, batteries, ect....
The total price for a team kit(not factoryteam), plus an os cv mill, and an avg radio, like a jr xr2, will set u back somewhere around 450.00. add another 80.00 for the cv-r engine.