I had an 08 Omega before the SS, had SSL king springs fitted to it and it cost pretty close to $580 if i remember correctly.
That was fitted and wheel Alignment done.
Now please listen to what i have to say in regards to the "non fitment" of lowered shocks when running lowered springs.
On a good road surface you will not notice much of a difference in how the car rides, but show it's nose to the nearest bit of crap road and i can promise you that not having the correct shocks to match the springs will bite you in more ways than one.
I admit that i made that mistake when getting the springs for the Omega, i did not put enough thought into the overall package as i should.
And the ride quality and stability suffered as a result.
I am now in the process of saving for a Spring and Shock combo for the ute, because the ute only has springs at the moment which is not acceptable as far as i am concerned.
A friend of mine owns a SS sedan and has had spring and shock combo fitted and the ride and handling is far in advance of mine with just the springs.
I also understand that cost can be an issue and the springs may be an attractive option for the short term.
But you can now purchase good combos for pretty fair prices of places like ebay, and also one of the site sponsors here at Just Commodores.
GSL RallySport .
In the end it's up to you mate what you buy, i am only sharing my experience with you to try and give you a heads up on what the VE Omega feels like "without" the full combo applied.
Cheers.