I think this depends on what you're planning to do with the car (or end up doing, search Zeditis on here!), the HR engine is good up to 500hp+ without needing new internals etc, I'm not sure what the DE is safe to, 400-450 ish I think. Even if you're not going to push that kind of power, long term reliability will play a part, short term their are other benefits to getting a HR (responsiveness etc) so it just seems pointless buying a DE '07.