comment all that out^
have you tried disabling agp, since it seems to hang just after setting x8
I would give the kernel agpgart a go, it will probably be faster too
fyi this is what I get after that section:
(II) NVIDIA(0): AGP 8X successfully initialized
(II) NVIDIA(0): Setting mode "1600x1200"
(II) NVIDIA(0): Using the NVIDIA 2D acceleration architecture
(==) NVIDIA(0): Backing store disabled
(==) NVIDIA(0): Silken mouse enabled
(**) Option "dpms"
(**) NVIDIA(0): DPMS enabled
(II) Loading extension NV-GLX
(II) Loading extension NV-CONTROL