I've used the Mothers Clay bar with great results also - I have the powerball & it's not that great IMO, your experience may vary...lol.
As for polishes I still like Meguiars Nxt Generation but Autoglym is still my favourite by far for paintwork.
Carplan Black Wax is hard to beat for dark plastics (I don't believe it's available over here though).
T-Cut is my fave for removing swirls & scratches (also a UK product, Meguiars Scratch-X isn't bad though).
Meguiars Endurance High Gloss Tire Shine does a great job on...err..well Tires of course...lol...also other rubber items (air intake for example).
Meguiars Nxt Generation Tech Protectant is great for interior trim.
Invisible Glass cleaner is great on glass (of course) but it's foaming action is awesome for taking bugs off the car in general & does not hurt the paint at all.
Think that about covers my detailing kit aside from a selection of old toothbrushes for cleaning the grille & radiator (yes I know I'm sad..hehe), various microfibre clothes (2 for each type of polish, one to wipe on, one to wipe off), laytex gloves (cleaning tires can be messy), 2 sponges (one for the paintwork, one for cleaning tires & wheelwells), chamois leather, California Duster, California Duster Flexible Water Blade & an empty cat litter container which fits inside the bag & makes a great bucket.