instead of me trawling through all my CS sets and installing them again, i have decided to just leave them for now and only get what i need for my current project...

i am in need of CS sets that can make amazing looking caves. its only a small cave but it needs to look good as its at the start of a ride. it will have a stream going through it too so some fish and water effects would be a nice little touch

Well, every "Rock" CSO-Set can be used to create caves. Only thing you need is time for it.
It needs some practice which stone combos looks good or fits better to each other.

If you want it simplier, than you can use "WeberDeepCaverns" set, because there you have prebuild pieces for caves that can covers a track or parts of the track.

For water effects you can use "NF Particle Effects". If you want some dripping water from a wall, you can use a special shower trackpiece from the ingame "Water-Coaster".

Soo long, Cobra