Lisa,
I think that with the analog outs as you have it setup you are going to have a fantastic setup. ARCAM makes stellar sounding products. Better to have an older ARCAM than a newer, lower end receiver. Also, receiver technology changes so quickly you have to jump in at some point only to see the new models and features come out next year.
Some setup thoughts. Your setup as Scott said is going to be just fine. The only item to note is that the sub cannot be a further distance than the mains. The Oppo won't allow it and will not allow anything to be greater than the mains for distance.
In terms of EQ, yes, you are correct the newer stuff tends to have EQ; however having the speakers properly setup and the room properly treated is a much, much better direction than an untreated, improperly setup room wit EQ. I suggest spending the time to tweak and perfect the setup if you haven't already. Some reviewers don't like the EQ in their rooms. it's there as an aid not a magic bullet.
Finally you have really great equipment. Enjoy it thoroughly. Good sounding equipment isn't cheap but it will offer you years and years of enjoyment at a level other equipment can't touch. The Oppo BRP is just a fantastic piece of equipment. Unless you are using a video scaler lip sync shouldn't be an issue. So setup that Oppo with the AnLog outs and configure the speakers and forget about it and enjoy. And don't forget you still get the ARCAM advantage on all other analog and digital sources like streaming, CDs and broadcast video.
And when you are indeed ready to upgrade you will hopefully have had years of enjoyment. There's always a next thing but right now, you have a really good thing.