Multiple Aggregate Functions On One Table

I have a table called Transactions with these columns : TransactionDate, DRCR,TransactionValue,AccountNumber

TransactionDate - Date on which a transaction was done

DRCR - Shows whether the transaction was a debit or credit

TransactionValue - How much was transacted

AccountNumber - The client's account number.

My request is to do a Monthly High Low Balance Report.

The report should show Highest Balance(maximum value of credit transactions),Lowest Balance(minimum value of debit transactions),TotalCredits(sum of all credit transactions), TotalDebits(sum of all debit transactions). These will be filtered using Transaction date. A user can select start date as 1 June 2013 and end date as 30 June 2013. So the report should show data filtered to this period.

I tried this query but its filtering to the period specified.

SELECT   AccountNumber,
                             (SELECT        MAX(transactionvalue)
                               FROM            Transactions
                               WHERE        (trans_drcrindicatorname = 'Credit') AND (transactionaccount = @AccNumber) AND (transactiondatetime BETWEEN 
                                                         @StartDate AND @EndDate)) AS MAX_CREDIT,
                             (SELECT        MIN(transactionvalue)
                               FROM            Transactions
                               WHERE        (transactiondrcr = 'Debit') AND (transactionaccount = @AccNumber) AND (transactiondatetime BETWEEN 
                                                         @StartDate AND @EndDate)) AS MIN_DEBIT,
                             (SELECT        SUM(transactionvalue)
                               FROM            Transactions
                               WHERE        (transactiondrcr = 'Credit') AND (transactionaccount = @AccNumber) AND (transactiondatetime BETWEEN 
                                                         @StartDate AND @EndDate)) AS TOTAL_CREDITS,
                             (SELECT        SUM(transactionvalue) AS Expr1
                               FROM            Transactions
                               WHERE        (transactiondrcr = 'Debit') AND (transactionaccount = @AccNumber) AND (transactiondatetime BETWEEN 
                                                         @StartDate AND @EndDate)) AS TOTAL_DEBITS
FROM            Transactions 

Good is not good enough when best is expected !!!