Well to be honest I was saving up for vehicle weapon unlocks mostly... but MOST of the necessary ones are in the 500-750-1000 range. Basically ridiculous numbers. My next unlock I'd like is A2A rockets for the reaver.
Same thing with MAXes, 2nd hand weapon (ie: left hand burster for example) is ridiculously expensive.
Other choice I'd be interested in is the S2A or S2S heavy missile for tracking capabilities. Yet those too are stupidly expensive.
Basically, anything categorized as "useful" is expensive. For what it's worth, I've already put cert points into most everything basic and or necessary to get along. I am BR20ish.
It definitely seems to designed to encourage use of real-world money on weapon systems, and certs on weapon-specific upgrades (as well as all other upgrades).
Aside from vehicle weapons, it seems typically such pay-for upgrades still really aren't in the Pay2Win category so I think it actually works out alright. I say that because, sure, rockets and whatnot will help you rape the battlefield, but at the expense of utility of that specific vehicle. So you get rockets, but lose out on a heavy machine gun, which makes it a little harder to fight against infantry swarming the area.
I'm considering just taking advantage of sales, building up a lot of station cash, then using all that to get the weapons I want. Then I can get the useful cert-only upgrades for the weapons, vehicles, and classes.
One good thing to look forward to: account unlocks will be globally applied to all characters (except for faction-specific unlocks), and when they do this, it will also be retroactively applied to all unlocks at that point in time.
I'm hoping that, and server transfers, are coming soon. I know their priority focus is on overall bug fixes and performance-related improvements, but these additions are also not major new features that will require a ton of resources to get them implemented.