The main Export > Quicktime Movie will get you the full rez output at the same settings as your sequence.. in my case, 4x3 DV @ ~ 1Gb/10Min.
Export > Convert using Quicktime will give you good web output. I use the default LAN settings for large files and the next one down for the smaller files. Works like a champ and you don't have to leave Final cut to do it... although if you have a newer version, using compressor is also an option.
I often also dump out a full rez Quicktime using the first method above, then pull that into compressor to process the files into web versions while I do stuff in the foreground.