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Car battery finder from VARTA® - Find the best and most reliable battery for your car
You could buy Bosch but since the better Bosch batteries are made by VARTA what would be the point.
In selecting a new battery appart from the obvious dimensional/ terminal restrictions don't be too put off by slight differences in Ah ratings. The figure you want to look at is the cold cranking figure [ CCA]. A few years back to get an adequate cold cranking figure for a diesel you needed a large capacity battery to get that current. With improved battery tech smaller capacity batteries can often match the CCA figures of these big monsters of the past.