You can start with reading this thread.
Than I could recomend the RuRaider one from PigrateGhost, the Beta release 10 is stable and good. It is also using 2.3.7.
In the development section there is a thread which has Unlocked Stock, with CIQ stuff removed which also is good and stable rom.
unlocking atm... cant get teh fastboot exe..gotta update something..,
problem.. i cant get the dam fastboot.exe file. it says i need someting r16 i believe, and i try to update it, but it takes pretty long.. i back up out of it a few times but still same thing, looks like its updating everything (google api's...)
I recently unlocked my Vivid, it sounds like you're talking about the part where you have to download the Android SDK, yes? After downloading the SDK, there are 2 parts of the SDK you need to add before you can begin. If this is where you are at, try the instructions here: http://developer.android.com/sdk/index.html.
Also, try unchecking everything that's checked in the SDK program, and only check the two parts htcdev instructions say you need:
"...You will see there are many packages you can update. Please install Android SDK Platform Tools and Android SDK Tools (Please update it if your SDK version is r11)."