Maximum speed of 54G is about 3MB/s. Maximum I have got over wireless N is 7MB/s. 100mb LAN should be about 12MB/s, Best I have ever got from 1000mb LAN is 45MB/s though normally closer to 25MB/s.
Can your NAS be hard-wired over Ethernet or is it one of those wireless only units? If you can hard-wire it I would try it over 100mb or 1000mb and try to find the units limit, If its 6MB/s then you know wireless N should be fine, if the max speed is about 4MB/s or slower then you may find its not worth the investment in N for 1MB/s increase.
Most HD videos I have watched can stream comfortably over 54G for one stream though you wont be able to do much more with the wireless than browsing the internet (No fast downloads) or the video will start to stutter. If you find your NAS is fast enough and you have the need for multiple video streams or more intense use of the wireless for other uses (Or users) at the same time then N may be an option.
---------- Post added at 10:56 ---------- Previous post was at 10:54 ----------
Quote:
Originally Posted by Damien
If everything but the NAS is connected via wireless then the bottleneck won't be the speed the nas can talk with the router is it? So gigabit would be useless because the wireless speed is much slower?
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Thats right because if the router is 54G then the maximum total bandwidth is 3MB/s so the wired connection to the router between the NAS is redundant.