I had no camber arms on my dc2 for ages, was lowered on coilovers and I had the tracking setup - just the toe. You do not need aftermarket toe arms to set toe up tho.
My tyres lasted over 2 years and they were parada spec 2's @5000miles a year.
Its a case of where you want to stop? You could start re-bushing etc.
If youre changing to coilovers, you'd be as well doing arb drop links + arb bushes and rear lca's as the bushes will be worn out in those.
I found out the hard way by only putting on coilovers to then practically change everything
. To get a full geo properly set up when your car is lowered youll need front and rear camber arms. Toe'ing arms are no essential in the slightest as toe is already adjutsable. Dont lower the car to much is youre running camber arms with the bolts adjustable from the top. Its really a pain to adjust camber so my advice would be get the new Skunk 2 camber arms and cyberspeed rear cambers arms.
Beware, hardrace and Meister camber arms are a total pain to adjust on the car. (Front). They have adjustment screws on the top - which is by far the most stupid thing I've ever seen.
I know I was saying the quality was amazing on the hardrace and it is...I just had a full FRSU today and the front camber was a nightmare, you have to keep jacking the wheel up and take inner arch liner off to get to the screws.
Obv when you jack the car up the alignment changes when lowered again, so it's a guessing game to see how close you can get it!!!!!
Skunk 2 do a Camber kit which you can adjust from the bottom - best way.
No quality issues with either cyberspeed or hardrace...but come on, who would honestly design them to be adjusted from the top!!!!!!!!