AVCHD to Uncompressed Video File Conversion Factor

I have a Canon HF S21 camcorder and I'm looking for a conversion factor from AVCHD to Uncompressed Video Files when filming in maximum video resolution of 1920 X 1080. I want the conversion factor to size an eternal firewire hard drive for editing my videos in Final Cut Express.

Whilst I have no experience of AVCHD other than a few clips from the DVD in Tom's book, I have used ProRes and Apple Intermediate Codec which is what all AVCHD is converted to before editing in FCE/FCP and the USB 2.0 Hub and Hard Drives combination has worked flawlessly.
Of course, until I have actually used an AVCHD camera I won't be able to comment either way with any certainty.
For a while I have been wondering whether PAL or 25fps based cameras act slightly differently from NTSC or 30fps ones with regard to ease of editing my way.
Here's an example I posted some time ago, though be aware that the image has been reduced to 1280x720 and a very low data rate was used in order to keep the file very small because of a monthly cap on my internet use.
http://vimeo.com/11190626

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