TCCaddie,
You are in for a real treat, both of those course are top notch(I played both this past October). Flap is correct, the Dye course is a shot makers delight (one of the rangers told us a few years ago, keep it left on the front 9 and on the right on the back, it was great advice). The Dye course is head and shoulders above all the rest of the Barefoot courses. They are nice, but don't hold a candle to Dye.
Regarding Grande Dunes: This is probably my favorite course in Myrtle(we have been playing this every year since it opened). It is always in top-notch shape, each hole is unique and there are some really nice views. I don't know how big a hitter that you are, but if you are one and the conditions are right the 6200 yard tees play a little easy.
We are headed down to Venice, FL tomorrow morning and playing the course you recommended on Thursday(Legacy at Lakewood Ranch). I'll let you know what I think. Thanks for your recommendations by the way.