Your best bet is to go on
http://www.detailingworld.co.uk/forum/index.php search for the item you want and see want other people feel about it and what their recommendations are.
At the end of the day, its only about what you like and what you are happy using
Absolutey this. I've started building my collection up again and I literally have listed what I need (shampoo, applcators, MF cloths, etc) and then popped over to DW and used the search function to read what people recommend.
Also, as said, what 99 people think is fantastic you might just not get on with sometimes it is just trial and error. Dodo Juice is a very fashionable product at the moment so people seem to want it just for the name and not necessarily for its quality. It's generally good but there are a lot of good products out there...
You'll want:
Wash mitt
Shampoo
Clay
Degreaser / All Purpose Cleaner
Wheel cleaner (may get away with APC and shampoo)
Wheel brush / Mitt
Drying towel
Microfibre cloths
Wax / polish applicators
Polish (by hand I assume)
Wax / Sealant
Trim restorer / protector
Tyre dressing
Wheel sealant (can be same as your chosen wax / sealant if good durability)
Glass polish / cleaner
Metal polish if exhaust pipes on view
Have I missed anything, except all the interior goodies?!?