My preference would be to go with COBRAS. If you stand up both Unity systems in the same domain, you are going to use GSM in some
capacity (primarily it's a "move" operation that moves user objects from one system to the other and cleans up all the AD attributes). You can still (and is noted to do so in that scenario) do that as part of a COBRAS migration. Where you gain from COBRAS is the seemless retention of user data, call handler data, and so forth. Where you put in work (but still gain) in a COBRAS migration is that you still need to build out some configurations on the new 7.x server; however, in many cases I see this as an opportunity to avoid the "garbage in, garbage out". You can actually think about your Subscriber Templates, Class of Service, and etc as opposed to, what often occurs, using the defaults. If it were me, I'd go COBRAS. I have a long presentation I can send you a link for on that. In conjunction with COBRAS help (and Jeff Lindborg) frequenting the boards, there is a lot of support out there for you. In addition, COBRAS is a TAC supported tool. My 2 cents.
To answer your question about will GSM work with the new server being built with different service accounts - I would say you have to look at it differently. For those service accounts, GSM won't be needed because they've only ever homed to that server. However, for all of your users - you'd still need GSM to clean up their associate with one system and associate them with the new.
Hailey
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