Point of this thread being? You want a sub $300 guitar? You have a guitar and want to spend $300 to modify it? You need to be specific and provide more detail. Singlecut? Doublecut? Strat style? Super strat style? 22 fretter? 24 fretter? Floyd? T.O.M?
If you are looking for a guitar, please.. do yourself a favour and start in the guitar review section. You can always check out subversion's blog which has tons of gear review many covering the sub $300 budget.
If you have $300 for modding, I am sure a quick search through the forum will easily yield you your intended results.