[Aragorn]

A decent 54G wireless should able to handle 10Mb fine - although if you have any interference / channel contention it could be slowed down (try copying a large file from the wired PC to the wireless to see how fast it really is.

As for the other options, you 'aren't allowed' to touch the caox going into the router, so really you are only left with option 3, which with a Cat5 patch cable shouldn't cause any speed issues.

HTH