Hallo. I'm new in this stuff so forgive my unawareness... I wish to root my DHD but I am a little confused. I read the articles of why to root and the diffrences between temproot and permroot. I was thinking of permroot, backup my stock recovery image file and then have fun

Is it possible to temproot my phone?
Android version 2.3.3
HTC Sense version 2.1
Baseband version 12.54.60.25U_26.09.04.11_M2
Kernel version 2.6.35.10-gb2564fb bla bla bla...
Build number 2.50.111.5 bla bla...
Software number 2.50.111.5
Browser version WebKit/533.1
If temproot is not an option for me then I will most probably permroot.
If I downgrade (if it is possible), temproot, permroot and then upgrade to GB will I be able to backup my stock GB recovery image (will it be still there?)? Will I be able to revert in stock GB version if something happens?
Note that having a pre-GB version on the phone is not an option. I'd prefer waiting with the stock version untill root in GB will be possible.
Last minute question. If I use an edited ROM from my sdcard will the stock recovery image go away?
Last minute question2. (Forgive my curiosity)I can't tell if my phone is branded. On the back case it sais "htc" "with htc sense" "dolby mobile" "srs hd" and on front "htc". If it's not then I won't need a GoldCard right?
Thanks...