other than the cpu, optical drive, it is not much of difference between the m6811 and m6805, so theorically, it should work.
i honestly can't say about 2 sticks PC3200 in m6805. as said, i m on ONE PC3200 stick, my m6805 freezes when i put it the 2nd PC3200 regardless if it is 256, 512 or 1024 - same latency, same voltage - still testing with different modules and tweak
to be fair, the PC3200 would offer u a better bandwidth, but fanatical asides, unless u can bring the PC3200 down to the level of PC2700 in term of CAS-RAS-..., it would make little difference in system performance under the AMD64 architecture.
my vote = stick with PC2700 if u want 2GB