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A difficult one. I would go for polishing the barrel and doing the other upgrades and seeing if you are happy.

Some people now are saying 6.08 is the best. LRB is the best. R hop is the best.

I would go with the cheapest option - polishing your barrel and see how it improves things. But what other upgrades are you planning?

 

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Let put this clearer: You don't need to do the barrel first. There are better things to do before you buy a barrel.

The only time you NEED a new barrel is if you buy a hop chamber than needs an AEG style barrel (if your rifles doesn't already take a aeg style one that is).

Try polishing your current barrel - this might be enough.