It really depends on what you want to view your content on. One of the problems of viewing content on computer screens is that we sit so close we tend to see every little defect and imperfection in the video. That being said...
You need something to play the file back. This can be a taped-based camcorder with the necessary outputs or it can be another device. There are countless "Network Media Streams" out from companies like D-Link and Linksys, as well as hard drive based solutions from a company like Western Digital. These devices will all play .mp4 files, which you can easily create through Export with QuickTime Conversion or using another applications such as Compressor or MPEG Streamclip. Two other excellent options are the XBox 360 and the PS3. Personally I own the PS3 because it'll play a wide variety of MPEG-2 and MPEG-4 (h.264) material, including transport streams, program streams, and files. The Apple TV is another option, but is hamstrung by it's lack of power, and therefore can't play anything higher than 720p @ 24 fps or 540p @ 30 fps.
My recommendation is a PS3, even if you don't like gaming and you can swing it in your budget. Blu-ray support plus media streaming (via UPNP, which you do have to add seperately to your Mac, but Media Link costs $20) make it ideal. Plus it is robust in power and won't hiccup at high bitrate files like the Apple TV will.
When I encode (I use the Adobe Suite to encode but the bitrates can be similar for QuickTime) I encode with h.264 at 25 Mbps. High yes - but I've got nothing to lose since it's my own network and my own disk space.