Here in Canada, I normally pick up the biggest battery that I can afford and of course, size wise, enough room to hold.
I use 1000A CCA battery for my 400E, it's a V8 and battery is in the trunk, it supplies current through extra long cables to the starter.
For a I-4 190, I guess 500A CCA is sufficient.
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.