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What Should I Do With Money In Mafia Wars?

So here’s the thing. I have billions of dollars in the myspace app Mafia Wars and I have 300 of each thing in the inventory. I have 64 people in my mafia (mostly hired gun) and I’m at level 87.
1) If I have 300 of each thing in the inventory and I buy a lot of properties, what should I use all my money on???
2) Do I really need 300 items in the inventory or do I just need 64 items of each since i only have 64 people in my mafia?
Please help! Thank you!!!