Yup, no need to go all out on hop ups, unless your name is Randman
If you have alloy shaft holders you're in pretty good shape already for some stock and 19t racing. A range of springs would be a big help
For quick shock position changes the titanium top links are nice
Alloy battery strap is a nice touch if you don't like tape, I don't have the time for tape, and getting decent stuff in the UK is harder since it's not popular. I also got a kit from a batch that had the plastic strap missing, good excuse to buy an alloy one
I don't have any alloy hubs, no need for them other than looks. Although if I did add them weight would not be a problem, even with 3300's I have to add 10grams to get over 1500g.