>I was speculating that you could start with an array of something like 16 str, 12 dex, 12 con, and 12 Cha, with your bump putting them to 18, 14, 14, 14
For a human starting at 5th level, consider the following for a soldier (hit and run) 5, or a soldier (blitz) 1/solarian (solar weapon) 4, before themes:
• 1st Level: Strength 16, Dexterity 14, Constitution 12, Intelligence 10, Wisdom 10, Charisma 10
• 5th Level: Strength 18 (upgraded to 20 by personal upgrade), Dexterity 16, Constitution 14, Intelligence 10, Wisdom 12, Charisma 10
The character is now more durable than an equivalent solarian, and even has a little more Will.
It helps that a 5th level character can spend 3,910 credits on vesk overplate I, which grants a whopping +9 EAC, +11 KAC, +3 maximum Dexterity bonus, -2 armor check penalty, -5 feet, and 1 upgrade slot.
>As for the item level question
For a soldier (hit and run) 5 or a soldier (blitz) 1/solarian (solar weapon) 4 with 9,000 credits to spare, I would probably purchase:
• 3,910 credits: Vesk overplate I
• 3,100 credits: Armor upgrade, jetpack
• 1,400 credits: Personal upgrade, Strength +2
• 475 credits: Pike, tactical (yes, really; it is still cost-effective, and your other items give you durability, mobility, and raw accuracy and damage)
• Remaining: 115 credits
You might not have much for any ranged weapon beyond the cheapest of the cheap, but then, even if you did purchase one, it would most likely do little against the enemies you face.