Thinking about an wizard having heavy armor, the most "optimized" option seems to be:
Hill dwarf
str 8, dx 8, con 15 (17 due to hill dwarf), int 15, wis 15 (16 due to hill dwarf) cha 8
Level 1 Cleric (life domain)
level 2+ wizard (whatever school)
Gets full number of spell slots and can also...