I'd suggest you follow your gut instincts and do Psych.

Every VCE subject has its challenges.. whilst the content in Legal may
seem easy, getting a high study score in it may be a totally different story. (don't quote me

)
With regards to Business Management, I'd suggest you don't repeat it unless you get a really disappointing score in it this year. There is also a proclivity to slack off and be lazy in repeated subjects.
I am, by no means, the subject selection guru though... Let me show you my subject selections over the years:
Year 10 2009- English 1&2
- Methods 1&2
- Biology 1&2
- History 1&2
- Science
- Personal Learning
- Latin
Year 11 2010- English 3&4
- Methods 3&4
- Chemistry 1&2
- Latin 1&2
- Legal 1&2
Year 12 2011- English 3&4
- English Language 3&4
- Philosophy 3&4
- Latin 3&4
- Legal 3&4
- Methods 3&4 (repeat)
So yeah.. you'll notice I've dropped many, many subjects. But I'm happy with the final 6 subjects.. it was all a process of elimination.
But I warn all of you year 10s out there.. do NOT follow my subject selection sample!
