[derekc]

I have recently purchased a Sony HDR xr520ve HD camcorder which gives full AVCHD files. I want to import the files, edit and add captions etc, and then burn the result to a DVD which can be played in a DVD player or Blu ray (I have both) without loss of quality.
I purchased Serif MoviePlus X3, being told that it would do the whole job. It does indeed import the AVCHD files, and gives me satisfactory editing features. However, it only allows me to burn a disc of the resulting project to DVD standards.
Is there any software that will either do the whole job, from importing the files to HD quality burning, or allow me to burn the output from Serif (avi or m2t) to give a HQ final disc.
Sony’s own PMB software bundled with the camera has an AVCHD creation option, but not the editing facilities.

[rogs]

You'll need something like Sony Vegas to do what you want, although if you really need to do the whole 'menu' thing with Blu-ray, rather than just burn the edited file directly from the timeline, then you're going to need the 'pro' version. Sadly, that's a lot more money!

Here's a comparison between the various Vegas options

Sony Creative Software - Vegas Pro 9 - Vegas Family Comparison

Edit: There are other programs I should have mentioned, that have most of the Blu-ray writing facilities of the Vegas Pro package, but are a lot less money. You might check out Corel Videostudio, or Nerovison.
Probably worth a quick google to check that they work OK with Sony AVCHD.
In the early days of AVCHD, the different 'flavours' from the different camera manufacturers meant that that were some editing program compatibility problems. (Panasonic AVCHD wouldn't work with Vegas, for example), but I think that's all been resolved now.