Guidelines for SGA and PGA tuning for 10gR2 RAC and ASM ?

I am looking for tuning information on SGA and PGA tuning for Oracle 10g (10.2) RAC and ASM for a 4TB OLTP and DSS mixed environment on Solaris 10 platform.

We are running Solaris 10 SPARC 64 bit with Oracle 10gR2 RAC Enterprise Edition and ASM on Sun servers with 32GB of RAM for memory for a 4TB OLTP database.
It is in design phase so I do not have an existing AWR or Statspack report yet. Is there a best practices guideline on how to size parameters for the SGA (ie: shared_pool_size, etc) and PGA for this environment from Oracle?

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    Thanks for this Justin.
    Here the exercise is to add 4 CPU's  and 32G RAM to the server  earlier it was with 4 CPU's and 64G RAM  this was decided  by the server support team .
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    PL/SQL Release 11.2.0.2.0 - Production
    CORE    11.2.0.2.0      Production
    TNS for Linux: Version 11.2.0.2.0 - Production
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    04:10:02          all     86.47      0.00     12.52      0.99      0.00      0.02
    04:20:01          all     84.83      0.01     11.80      3.21      0.00      0.15
    04:30:01          all     76.23      0.00     10.30     12.34      0.00      1.12
    04:40:01          all     79.14      0.00     12.07      8.30      0.00      0.49
    04:50:01          all     77.63      0.00     12.19      9.40      0.00      0.77
    05:01:01          all     75.95      0.00     10.50     12.80      0.00      0.75
    05:11:01          all     83.21      0.00     11.98      4.54      0.00      0.26
    05:21:01          all     76.37      0.01     11.20     11.49      0.00      0.94
    05:31:01          all     77.97      0.00      9.04     10.30      0.00      2.69
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    the oracle is set as automatic memory management . it is not an RAC environment .
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