As far as it being slower then the G, do a firmware update. I upgraded my WRT54G to a WRT310N and I didn't notice anything different except internal file sharing at first. Then I got pissed because my internet seemed a little slower (youtube vids loaded a little slower, downloads weren't anything impressive). A firmware update helped a little and now I think its on par with the WRT54G as far as Internet speeds go.

Good luck.