Hey mate.
You might want to disclose your location before anyone will be able to give you some advise especially on price.
However, i can tell you that your budget is a little slim no matter where your from.
If you have a read, you'll find most people will point towards the MC21 as its responds the best to simple modification. Not saying MC16/18/28 are no good, just takes more time and money to achieve the same result.

Tyga do a 300cc kit. You will find a link to their site in the ' LINKS' section of the forum
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