Definitely the regular entrance.
A lot of people will say not RSR as sometimes it starts running right away, but sometimes it takes them a while to get it up and running (like maybe even 20 or 30 minutes). We are WDW vets, and for us we still go for RSR. It is one of those that is worth multiple rides. I would rather have to wait 20 minutes first thing in the morning, than only ride it once with a FP or have to wait in line an hour or more for another ride in the standby line later (the single rider line is great though if everyone in your party is old enough for single rider). If you pick RSR, search for the wide right technique on these boards, to get you to the front of the line once the gates open.
The second choice is typically TSM. Being a WDW vet, one thing for you to realize is TSM is not like it is at WDW. TSM does not have an hour to an hour and a half lines for most of the day like you fine at WDW. There is no FP for TSM, but even when we were there in mid-July the line was typically 20 to 30 minutes- hitting 45 mid-day. So, while it is still a long line and priority- it is nothing like it is at WDW. We do miss the FP for TSM at CA, but we also can ride it more than once in a day if we feel like it at CA if the lines are only around 20 minutes which is something that we never get to do at WDW!
It is the same with Soarin. While at WDW, Soarin typically has a 60 minute line, in July at DL we have ridden it mid-afternoon with a 20 minute line. Also, most times the FPs don't run out in the morning like they do at WDW. We have walked up in the afternoon in the summer, seen a 30 minute line, pulled a FP that kicked in 40 minutes later, ran around for a little bit doing other things and then come back and walked on with our fast pass. Since it has been closed for refurbishment, it may be more crowded, but by WDW crowd standards we LOVE Soarin and TSM at CA!
PP Jina's plan sounds like a really good one too though. She is right that the lines get huge for RSR FP, immediately after park opening. Last summer the day we were there for EMH, they let the EMH people line up really early and the line was already big by the time we checked it. I think maybe that was about 20 minutes before regular opening, but I'm not sure on that.