My point of view is a Boxster is a 2-seater car, that will depends on you whether you want a 2seater or 4seaters. At least the 911 C4 can still squeeze in passenger at the back. Porsche in Singapore had launch their new 911 C4 last year and it comes with a Cabrio and coupe. And the new Boxster is coming in soon, why dont you go down and compare both cars before you make the decision? Your C4 is more than a 10yr porsche piwis 2 old car, I guess it's time you trade-in and change. Boxster only comes in cabrio, and cabrio cars tend to be more noisy cos of the cloth roof top. Whereas a coupe is make of hardtop. If you were to buy a 911, chose a coupe, at least you can open and close like a Boxster, but at least that will keep the noisy level on the road down in comparison to a Boxster.