Think this is like my second post here but I have got a bounty of information through this site just not specifically for my ride this time

I want to put some 17" mags with a descent tyres, my workmate was telling me that if I'm going to lower my car it would increase the wear on everything else and that I need to ensure that the car would not bottom out.
I'm not going for crazy low 35-40 off the factory would be fine.
Trying to maintain some ride quality (Kiwi roads are fuct).
Is there a way to reduce this wear?
Can anyone offer some advice about the best way to go about this?
I am currently looking at $1800 - $1900 for 17's descent tyres - not just rubbish, springs fitted.
I feel like a real noob I know enough about cars to keep them serviced and how things work but nothing advanced.
Will I be paying too much (I'm talking brand new parts) and can you offer an alternative, I'm based in central Auckland.
Help welcome, thanks!