Hi,
If you are really looking for a serious upgrade in your vinyl listening, it has to be the TT first, especially since you are using a Scout 2. You may get more detail if you go for a more expensive cartridge but the weight and power of music will remain same/similar. My suggestion would be to look at something like the Rega RP8. Cartridge can be decided based on your remaining budget. It will take the sound to a higher plane in a more wholesome way IMO.