Do you have any progress there? I have exactly the same problem.
My system reboots al the time during installation after a few startup strings.
None of the keys helps (tried -f, -x, -s, cpus=1, platform=x86, arch=i386, force64 in lots of combinations - nothing).

I've got AMD Phenom II 945, 4Gigs of 667MHz [800MHz unstable] RAM, HD 5770 and a SB700 mobo.

Couple of days ago i had this pretty distro working perfectly on my mobo with Geforce 9800 GT and with Athlon 6000+, without any kexts or anything. But after a small upgrade it won't boot any more. Even from install DVD. Even in single user mode.

I also had working iAtkos 7 distro, but without videocard support.

Question to pros: are there any keys (kernel=... maybe) that i should try to get install process working?