Are we going to have a new special version DVBDream 1.5 Windows 7 for X64 like ProgDVB has 64-bit version?
Do you use any 3rd party plugins (plugins which are not a part of DVB Dream installation package), like EPG plug-in, etc.?
Are you aware that you can not use these x86 plug-ins with x64 applications?
If you want to continue to use these plug-ins you have to ask their developers to crate x64 versions.
just my 2 cents (for you to know about headache you will have, while advantage of x64 DVB application would be miserable, if any)