Whichever perks you like, try to go broad, rather than deep, into any skill group. Not only is each perk level gated by its own skill test, but many skill benefits (like ship building) are level gated. And the best perks in each skill group require multiple levels of perk investment in previous skill group tiers. If you choose a selection of lower level perks from each group, you are always making progress on something, and never waiting for a single perk to be available.