At least you've made your mind up and can now get on with the build.
The DNA kit is bigger and you may need the suspension kit for the car, there's plenty of info on this site and you should be able to see the DNA suspension parts on or off a car.
The VVti is a good strong engine and can take a few mods to increase the power, one of the main criticisms of a replica is lack of power. A few adjustments will reap the rewards once you're driving
1) The DNA exhaust is made for the kit, but stainless one will look better and last longer aswell as helping the gas flow. (get rid of the precat!!!!! beat the hell out of the ceramic whilst it's off the car, these are standard fitment but only necessary for California emissions)
2) Pipercross/K&N air filter will allow the engine to breathe better, don't worry about forced induction.
3) A stable power chip from a reputable Dyno tuning shop will open the engine to it's true power, post on "twobrutal" to find a good tuning shop in your area and ask if you need to uprate the injectors.
If you trail around the forum you'll notice a fair % of engine upgrades to the 3.0 or 3.5ltr v6 engines, the kit is great, it's the power guys seem to crave.
Where are you located, I'm sure there'll be a DNA owner around.
All of the above is just for information, the engine upgrade can be done at any time if at all.
regards
D