I would not mess with putting in a bigger battery. If your charging system is working properly, and the car is driven regularly, the specified battery will last. If the car is not driven frequently, then you need to get a battery tender.
Pep Boys has a Bosch battery for around $100.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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