I went for Powerflex bushes and Bilstein B4 shock absorbers. I think the ARB is whiteline, but I'm not 100% because I bought that second hand.
The B4 shock absorbers are basically OEM kit, so they are easy to change and just improve things 1000%.
Octavia shocks and springs may
help, but if you're buying new you might as well buy ones designed for the Toledo, or if you're buying used then there's no guarantee they'll be any better than what you have. It's not just Octavia gear that's available to you though, virtually any large engined mark 4 Golf based car will do. I think the application list for the Bilsteins include Golf diesel/VR5/VR6, Passat, Octavia, Beetle, the list goes on.