Hi.
IMHO.....If I were you I'd brake it down and look at the price of the individual items..
The 500
Here is £329 free p&p. That's £141 for all the other bits & bobs, Wilko have these
buckets for £9.50.
The "Inline Carbon Filter Complete With 2x10 Litre Buckets" there's better ways of doing this...the hydrometers £3/4 off Ebay...
A quick summary....in the Equipment list after the plastic buckets most of it you may already have?? jugs,plastic tube,spoons etc etc.
In the Consumables list, I don't use the turbo yeasts not now..I did when I first started like a lot of folks...but I know better now and stick with bakers yeast. I have used the essence in the past, but after being on the forum since 2013 I've learned a better way of doing things.
The ball is now in your court....

there's an old adage " ask 10 people a question, and you'll get 11 answers".

all the best with whichever road you take.