Have you tried security oriented distro Operator.iso by ussysadmin.org? It is based on knoppix and debian. Also it is one of the best network testing and pen testers tool?
HP ProLiant MicroServer Gen8 G8 G2020T 8GB RAM 4x 1TB HDD 4x 3.5" 712318-421
$249.99
1U Supermicro Server 10 Bay 2x Intel Xeon 3.3Ghz 8C 128GB RAM 480GB SSD 2x 10GBE
$273.00
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00
$198.00
HP PROLIANT MICROSERVER GEN8 PENTIUM G2020T 2.50GHZ 4GB RAM NO HDD/OS T8-E6
$108.00
HP ProLiant MicroServer Gen8 Onboard SSD Xeon E3-1220L 16gb RAM (4) 4TB HDs
$250.00
SuperMicro Server 505-2 Intel Atom 2.4GHz 8GB RAM SYS-5018A-FTN4 1U Rackmount
$202.49
HP Proliant MicroServer (Model: HSTNS-5151) NO HARD DRIVES-Power Tested,
$99.99
Supermicro 1U Server X9SRI-F Xeon E5-2640 v2 2.5Ghz 16-Cores / 64GB / No HDD
$149.99
2U 12 Bay SAS3 SuperMicro Server 6028U-TR4T+ W/ X10DRU-i+ Barebone 12 Caddy RAIL
$299.00