AVCHD 720p 50 fps files?

[wnic]

What I want to do is to edit AVCHD 720p 50fps 1506 kbps files from my GH2 and creating an output file with the edits and the same quality and speciifications as the input file. The edits I want to do are color correction, cutting and joining. I am aware that transcoding to an editing format most likely will be nessesary
I use Windows Vista 64bit on an Intel 4 core computer with 4GB RAM.
I have tried several programs and program combinations (free or below 200$) but always something has not been as I wanted, mainly the framerate has been lowered to 25fps.
I believe that Adobe Premiere Pro can do this but I cannot test it since the trial version does not support AVCHD and I am not prepared to pay about a 1000$ just for finding out that it cannot be done after all.
If anybody has managed to do this I will be very gratefull for a description of your method

 

[JeganRX]

This honestly sounds like more an editing question than an encoding question.

No you won't have to transcode to edit, but depending on the editor this could prove challenging otherwise. You can freely encode (very high quality) H.264 video using x264, so this is not a concern, but you're going to have to encode no matter what if you're doing such edits. You CAN edit losslessly, if you use a lossless codec, but ultimately, you will recompress.