It's all really about personal preference.

I trapeze very low, and i use a adjuster alot to get myself as low as possible in breeze and i have to adjust up when we tack to be able to reach the discs (which are already low). Crewing on the F18 i have a simple 2:1 system (same as most monons) with only a bit of bungy on the actual wire pulling it up to stop it flapping about which means in light conitions i can move in and out without touching the handle and keep triming the main.

My helm has a nacra/mastrom system which i think is the best one if you want a adjustable with the ring being pulled up.

I'll try and find some pics.

its all really about what you like, i move my adjuster alot so i have a system the works really well and gives me all the adjustment i need, while others dont adjust at all so dont need it.