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Seriously, before you get flamed to hell, please read through this forum section as the question is asked pretty much every other week.
Pioneer do some direct fit replacements, Hertz are sold for a good price by "MT Audio" on here, the rest is down to personal preference.
all depends on your budget and what you want from them either big sound or higher quality, if you want huge volume something like Fusion, if you want high quality something like JL Audio