I never spend the exact amount on both kids. I buy based on their needs and wants. Last year I didn't even get DD any toys. She got a new bedding set for her big girl bed and some matching accessories. The year before that I spent at least $100 more on DS. This year they are closer...DD is getting a big kids SN bouncer which was kind of expensive, and a ball pit, and a few other things. DS is getting a 3DSXL which is going to be almost his only gift. I wouldn't worry about it. They change so much from year to year.
Shauna, mom to Adrian, 8 and Charlie