(It's between 40 and 160)
If you have a wired network, you could certainly just stay with the 40, but if you're going B or G wireless (which is a little slower), it would be faster to load a large movie or song library wired, so a 160 gig would help give you more of what you want faster.
I'm wired directly, so I'll see 90 Mps between my system and the appletv. If you can get full N all the way, well, that is supposedly in the 100's of Mps, so even faster still.
I have both wired and unwired
TV's and both a G and an N network.
Some observations that may help:
- Loading an iTunes library to stream from can take some time - my library (10,000 audio tracks, 200 movies and 7000 photos) takes anywhere up to 2 or 3 minutes to load in to the
tv
- The amount of time to load the library to be able to browse it is no different for me whether Wired, Wireless G or Wireless N
- Apple TV Take 2 apparantly works differently - rather than local and streamed sources it shows all media in one place and works out for itself whether it is local or needs to be streamed. This may take away the delay on large librarys (and possibly even allow storage on a NAS of streaming media - please
)
- When streaming a file wired is quicker than wireless. However this is only in the few seconds it takes to start playing the file. Once underway it is (obviously) no different.
- Wired N does not seem to be any quicker than wired G at a practical level. If there is a difference it is minimal on starting a file and not something I have conciously detected.
- I can count on one hand the number of network congestion issues I have had on wireless G that have resulted in an interrupted stream. I can't recall any on Wireless N
- I use iTunes great syncing options to best effect including playlists for music, albums for photos and the 'last 3' or 'last 5' and 'unwatched episodes' so that as I watch movies and tv shows they automatically drop off the
tv and get replaced with new content. Works for me
- SYncing from iTunes to the
tv is obviously quicker on Wired, then Wireless N then Wireless G. But as this all happens in the background for me it is a non issue.
My bottom line recommendation:
- Get the 40 gig if not bothered about having the pc turned on for streaming.
- Get the 160 gig if want to hold a reasonable amount locally so pc can be turned off.
- If Take 2 includes streaming from non itunes held content get the 40gig and a NAS!
- If possible go wired.
- If not possible don't bother going for N wireless just because of the
tv. If other reasons for going N then fine but otherwise G should work fine imho (local setup/range/signal etc dependent)
Hope that helps.