For power management you will probably need this
http://www.insanelymac.com/forum/index.php?showtopic=258611
In DSDT you may need the LPC patch, if your LPC device ID isn't in AppleLPC, check if the kext is loaded running kextstat in terminal.
Other patches that you may need are UHCI and EHCI, if you have problems related to USB devices.
The patches IRQs and RTC are "generic" and should be applied in all cases.
Here you can find patches used in Sandy Bridge laptops
http://Olarila.com/Patches/Notebook%20Core%20i%20Sandy%20Bridge/
About kexts loading at boot, you have to enable UseKernelCache in org.chameleon.Boot.plist, or create an Extensions.mkext for system kexts.