this is a good between race dates maintainer;
http://batterytender.com/automotive/...-at-1-25a.html
This is a good at the races, between rounds charger on the 15 amp setting;
http://www.batterychargers.com/Produ...tName=94026499
And about batterys, a premium brand with high cranking amp rating should do a good job but you will get may answers on the subject.
The battery I am using just now is an A C Delco 78 - 7 YR Professional Series, very pleased with the performance.