Your getting quite a setup Rabbit80
Id recomend OS3.5 -people always say its slow but ive found quite the opposite, very smooth and get the dockbar from 3.9.
OS3.5 is designed for 3.1 Roms - unless your going to upgrade your kickstart chip you can Skick into 3.1 roms, this should be easy if youve got all your kickstarts setup for WHDload you only need to download Skick from Aminet.
Or you can use the Tool SetVersion to run OS3.5 on 3.0 roms
Caches try ADos command Avail.
Also if you havent got a scandoubler MagicTV