11g grid control patchset 11.1.0.1.7 question?

hello gurus,
I'm about to apply patch set update 11.1.0.1.7 to 11g grid control. I'm just wondering if you could share the experience with me. I have the following environment:
windows server 2008 sp2 32-bit
grid control oem and agent 11.1.0.1.0
web logic 10.3.2
oracle middleware 11.1.1.2.0
repository database 11.2.0.1

my goal is to upgrade
grid control 11.1.0.1.0 -> 11.1.0.7.0
web logic 10.3.2 -> 10.3.6
oracle middleware 11.1.1.2.0 -> 11.1.1.6.0
repository database 11.2.0.1 -> 11.2.0.3

 It seems to me that i should upgrade web logic first, and then repository database and last grid control. Is there any specific order i should follow? How do you check for version interdependency?

thanks

ying