I vote for the 375 ruger alaskan. It has a 20" barrel. I know you said you wanted a longer barrel, but there is not much velocity lost with the 20" and its handy as hell. Mine is extremely accurate and iwth a zeiss conquest, an awesome package. I also have a 458 lott in a cz and they are wonderful rifles. They do not make them in synthetic though. The ruger seems to be the one for you.
