yah I was going to avoid turbulators I think the fact the rad is a design out of circles that have several 180 degree returns so that alone should mix it up enough. I'm still stymied on pump selection, I don't want to buy a pump just to find it is going to stall trying to push a 25' column of water. That makes sense about the verticle area being negated by the return pressure. Although more and more so this design is going to a beast to bleed and fill. also I still have to look into check valves or ball valves as right now I would have no way of dissasembling the case once it is filled without loosing all pressure.
In case your wondering I started building the case a few weeks ago and it will probably be around a month until I get started on the radiator.
linky here
http://forums.bit-tech.net/showthread.php?t=109384