For lowsec, need to be more cautious:
HIGHS:
Probe launcher with 8 core scanner probes
Prototype cloaking device
MIDS:
Data analyzer
Relic Analyzer
MWD or AB
Scan Rangefinding Array
Cargo Scanner if you want to see if a can is worth hacking
LOW:
1 or 2 Warp core stabilizers
RIGS:
As many small gravity capacitors as you can fit