Huge HD file sizes in iMovie when importing AVCHD files from HD Camcorder

Question

Although several answers have been given on different ways to import HD files from a AVCHD camcorder, in this case a Sony one, the issue is what to do with the HUGE files it creates. I recorded 2 hours of HD content in about 30GB on the camcorder. I can burn those native HVCHD files on DVD's, took 6 of them, and play them on a Blue Ray player in HD. To edit, I tested a sample 50MB file that was about 3 minutes in length. It convered to quicktime file in the same 1920x1080 quality resulted in a file that was about 800MB, looked great, but how do I store or play a 20 minute version of it? iMovie is inadequate to do anything other than produce smaller size files for an iPod or lower quality, unless it is going to be a very short HD movie if doing true HD quality. One of the reasons I took the MAC plunge was the better multimedia capabilities. In this case, Apple (iMove and Final Cut) is behind.
I ended up shifting my HD editing back to a PC with $100 Sony Vegas software that can edit the AVCHD files and author in it. I can produce a DVD with about 25 minutes of edited HD in AVCDH file format and play it. I can also store the finished product in a much smaller space using AVCHD files. I have a 1 TB drive on my Mac that would be consumed if I worked in iMovie with converting all these AVCDH files and kept them in HD quality since it looks like it needs to expand them 12-16 times the AVCHD file size.
Yes, I know I could lower the quality to better work with them in iMovie, but that makes no sense to me. I want to record and edit in the HD format. Seems like these AVCHD cameras are becoming a standard since they are so efficient at storing HD content, iMovie needs to figure out how to edit and store them the same way. Very disappointed in how iMovie handles HD, to me it is NOT very good at handling HD, no good way to store or distribute it.
Am I missing soomething here? I have spent hours looking for a different answer, but have not found one yet? Maybe the next version of iMovie will be better. I like using it for SD DVD authoring, but for HD, did not work at all for me.
Jon

Answer 1

Interesting you say it is not meant for editing, but there are about a half dozen editor's for windows that will work on these exact files. I know with Sony Vegas that I have the same level of control with frame precision as I do with iMovie so I think there must be more to the story why Apple has not been able to support it like other software manufacturers who support windows. Don't get me wrong, i would love to do the work in iMovie and not have to learn something new. I don't have the storage space to use the HD apple format, that 2 hr of HD in AVCHD would turn into about 500GB then what do I put it on to play it. If the BlueRay standard calls for 25 or 50G disc's and we can get full two hour movies on them today, then they must be using a file format similar to AVCHD to fit on a disc, they cannot be using anything close to what Apple uses for HD files, it is just simple logic and math. So why doesn't Apple finure it out before everyone who starts working in HD comes to the same conclusion that the Apple QT file formats for HD is going to be an issue with space, you can create content, but cannot afford the disc space to store it or play it.