There are a ton of threads on this and lots of custom setups to look at. The rear speakers are standard 3.5" but watch the height. I have also seen people add tweeters to the rear next to the 3.5" speakers.
The fronts will require a custom mount as the only aftermarkets ever made that fit are no longer manufactured. The fronts are 4" plus a tweeter and the doors can go up to 6.5" with a custom baffle. The only interchangeable amp is the 996 6 channel amp, if you want more than that it will be custom.
The 'best' depends on what you want, and how much you want to spend. You can DIY the rears and fronts pretty easily, the door speakers are a bigger project, and an amp with require some technical knowledge. Good luck!
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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