I like Nemesis a lot more than I'm supposed to I think. I like the Borg a lot (obviously) but I thought by the end of Voyager they were getting used too often, and weren't always the incredibly scary threat they should've been. The only thing I'd have wanted to change would've been to give the supporting cast more to do. Especially Beverly, who's one of my favorites. I'd have loved to have had the Troi/Riker wedding have finally sparked romance with Picard and Bev.
Your plot does sound really good though, I'm sure I'd have enjoyed it. Data and 7of9 both dying sounds like a bit of a downer though.