Can offer my experiences, and the 'OOF recommended' mods
I run B4s with MV6 springs, with rebuilt front suspension (if you're going to spend the money on eibach etc springs and various poly things, then the extra bits required to completely replace for brand new your front suspension is chickenfeed in comparison, so worth doing)
The list is as follows...
Bilstein B4s
MV6 springs
ATP track rods
ATP droplinks
Noname wishbones with-
-Vx ball joints (any quality make will do)
-Polybushes - Powerflex iirc
-Vx rear bushes (only use genuine Vx)
repainted other original parts like steering knuckle, discs, calipers etc
Strut top mounts (very low mileage ones, better than the 180k ones they replaced!)
further mods....
-as you say, Monaro Poly rear doughnut bushes, around £100-120, sorry don't know the link as I bought mine off a fellow OOFer who never used them, but may on here will know where they can be bought. Recommended, tightens up the rear, stops the wandering/disconnected feel at the back.
-Poly ARB bushes come in the front Poly Kit, however, personally think they're pointless. But you get them in the kit, so no extra expense.
-To fit other Poly on the rear suspension is suggested this makes the rear a little too harsh, however personal taste etc.
Hub spacers not generally recommended, due to excessive wear on the hubs, however, not sure how many have tried to use them, and with what results. Feel free to fit, and give us a long term test, as I personally like the idea of tweaking the wheels out by a few mm. Be aware it is easier to replace the whole rear wishbone assembly, than it is the rear bearings, though!

Can't say for other springs, be it eibach and so on, however - you're right, over a 30mm drop at the rear is too much, 30mm at the front is within tolerance.

Hope that's helped a bit!

EDIT: Lazydocker beat me to it!
