I'm in exactly the same situation as you (except different hardware of course). There's 2 options you can try
1) Safest (afaik): Use ASU, it will patch your updates but your system will run fine
2) Go vanilla: install voodoo kernel and update like intel hackintosh (you won't need any patching), but I'm not sure if this will work since it's the 9.5.0 kernel on 10.5.2 - any confirmation would be nice.

btw: a little more patience would be nice