I use my 350z (DE Rev-up) as a daily and its one of the most reliable cars I've ever owned and a pleasure to drive.
As with any 10+ year old car you've gotta expect the odd perishable (battery, suspension bushes, exhaust etc) to need replacing, but other than that I think the only thing I've had fail was the radiator fans (which were easy to replace/refurb).
If you decide to go for a HR check if it's had the oil gallery gaskets replaced, if not they will need doing as some point which costs the best part of a grand.
Whichever spec you decide to go for they're all great cars, just make sure you get a well looked after, rust free example and you can't go wrong