Pros and Cons of installing CRS, ASM and DB in separate homes

Planning to install 11gR1 RAC a 2 nodes on HPUX IA64 and there are several architecture options:
Option 1:  same owner and one single home (home1 = crs asm db)
pros - easier to patch on single home
cons - patch level may be required at crs level but not allowed at db level because of E-Business Suite certification constraints
Option 2:  same owner and 2 homes (home1 = crs /  home2 = asm db)
pros - one less home to upgrade
cons - ?
Option 3: same owner and 2 homes (home 1 = crs asm /  home2 = db)
Is there any reason why Option 3 would be preferable or worse than Option 2?
Option 4:  same owner and 3 homes (crs home /  asm home / db home)
pros - each home can be on different patch levels
cons - more storage, more maintenance when patching
Any comments?

I've made my decision to use Option 2 and here's why...
Excerpt from Known issues documented in
810663.1 11.1.0.X CRS Bundle Patch Information
CRS Bundle Patch has been renamed as CRS PSU. CRS PSU and Database PSU are two separate patches, i.e. Database PSU does NOT include the CRS PSU.
There should be no conflict or overlap between a CRS PSU and an RDBMS PSU -- both should be applied to the ASM and DATABASE Homes.
Also note that CRS PSU's can be applied to all homes (CRS, ASM and RDBMS). The general recommendation is to apply the bundle patch to all homes unless the homes are on a different patch level. This is because there are clusterware binaries in the database home (e.g.: srvctl).
PSUs for the RDBMS should be applied to the ASM and RDBMS homes.

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