Id rather have a nice breadth during 3rd year that is different from my core subjects. Completing science subjects in breadth in first year will open up more pathways for me as i move into second year...that way i can sure i'm choosing a good major. Whilst if i do subjects complementary to my major in 3rd year, i think i'll die from all the science involved.
You have to fulfill the minimum amount of credit points for each component. That means that if you skip breadth for core in first year, u will have to make up for it at some stage. Think about whether learning more core suits you and if you are prepared to do slightly useless subjects later on when things get more serious.
Breadth isn't that useless.
I want to use my breadth for art subjects...such as international studies, Japanese, creative writing and maybe environmental studies. Things that are completely different to science, yes, but things that may help me discover what i want to do in the future. I'm aimless. So they're not going to waste...I just wish we could do more breadth...and that they counted towards something! XP