ABAP Stack vs ABAP + Java Stack

Hi All,
We currently have two SAP systems (one for FI and one for HR) both running on ECC 5.0 using a separate ITS box to provide CATS (via FI system) and ESS (via HR system)
We are about to upgrade to ECC 6.0 and replace the existing ITS with the Enterprise Portal.
The EP box will have both the Java and ABAP stacks applied. Now to the crux of the issue...
Do we need to
1. Install both the ABAP and Java Stacks on both the upgraded SAP systems
2. Just install ABAP stacks on both upgraded SAP systems
3. Install ABAP on FI and ABAP + Java on HR
4. Install ABAP + Java on FI and ABAP on HR
I have looked through a number of threads but haven't found a definitive answer to my question...
Your help will be rewarded...with points that is!!
Thanks,

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Error Details     LINE: 274
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client (of the productive client)
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      WP00                            SMP20       BCI      .0 PGM-disp+work    SEMW
      WP01                            SMP20       BCI      .0 PGM-disp+work    SEMW
      WP02                            SMP20       BCI      .0 PGM-disp+work    SEMW
      WP03                            SMP20       BCI      .0 PGM-disp+work    SEMW
      WP04                            SMP20       BCI      .0 PGM-disp+work    SEMW
      WP05                            SMP20       BCI      .0 PGM-disp+work    SEMW
      WP06                            SMP20       BCI      .0 PGM-disp+work    SEMW
      WP07                            SMP20       BCI      .0 PGM-disp+work    SEMW
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Kishore
949-232-5622 (Cell)

Hi Kishore,
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