You can use the entire proceeds of your sale immediately. That would mean that you would have 11K to dump in another stock. And the 25K is cash/stock total. The only reason you would need the 25K is to satisfy the pattern daytrader rule. Under that rule, you can only buy a stock and sell it the same day twice in one week. So if you purchased xyz on Mon and sold it on Mon and then you purchased abc on Tue and sold it on Tue you couldn't buy another stock and sell it on the same day for a week. If you don't buy and sell on the same day, (usually) then a margin acct with less than 25k will work for you. Hope that helps.
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