I'd be up for any of those, so will let others determine their price preference. I'm a sucker for trying to hit up the best course available while on a trip, but I'll be happy anywhere this early in the golf season! Have heard great things about the rebuild of Atlantic Dunes, but understand if paying $199 for a practice round can sound a little steep.
Without knowing the area, Old South Links looked pretty nice and has some cool looking holes from the satellite as well. It's just across the bridge in Bluffton - only 12 minutes from HHH airport and on the way from SAV. Looks like they may have some promotions if you wait until 30 days out to book (guessing it would range from $75-$95 at that time of year). At the same time, not sure how busy the bridge gets on Friday afternoons, meaning we may be better off playing on the island to get to the ferry.
Old South is fun. Like you said though, You're going to want to be as close to that ferry as possible due to friday afternoon traffic. Although it's usually coming off the island that sucks, there's always something that causes issues on the bridge/toll road.