Hi Mike,
Everyone will differ as to the best manufacture or tools and there's lots of brands to choice from, if you like the feel of the Hamlet or Crown you may wish to stay with one of their tools, a 3/8 (6mm) is a good size to go for and will soon size down for layout and tenons, less you want to go for fine or tight detail with beads, then maybe a smaller size, but I've never found the need and a 3/8 has always been fine, then the skew is the master, if mastered for rolling beads. Should at some point you'd want to make boxes, then you'd need to think about the 1/16 thin parting tool.
The awgb website has a range of Corporate Members under links, top names who supply almost everthing you could ever need and should you become a member of the Club, an the awgb a discount from some, that's if you don't find one before hand.
Have a look anyway at the Corporate Members, Peter Child's has some interesting topics for any first time turner.
Cheers David