Warning: Redneck logic being applied.
Flow is flow, I would suggest the siphon system and size the piping to work without going to siphon mode. I would just make a small u-shaped vent at the proper level and just count on it working as a regular straight pipe system. Much less cost and I think there is a definite benefit to having a deep water draw. In the rare case you you need to draw down the water level, you could always pump it for the money saved on install. To me, simpler is usually the best solution. added bonus is the lack of drainage system visibility in your situation, it would make a nice clean install.
