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?
DELL PowerEdge R730 Server 2x E5-2690v4 2.6GHz =28 Cores 128GB H730 4xRJ45
$458.00
HP ProLiant DL380 Gen9 8SFF Server - E5-2698 v3 - 32Cores - 128GB Ram - 1TB HDD
$299.00
HP ProLiant DL360 Gen9 Server 2x E5-2620v4 2.1GHz =16 Cores 32GB P440AR 4xRJ45
$220.00
DELL PowerEdge R630 8SFF Server 2x E5-2680v4 2.4GHz =28 Cores 128GB H730 4xRJ45
$379.00
Dell R630 Server 2x E5-2620 V4 2.1GHz =16 Cores 128GB DDR4 1x 960GB 2x 1G 2x 10G
$210.00
Dell Poweredge R210 II Server Xeon E3-1220 v2 3.1ghz Quad Core / NoRam / 1x Tray
$69.99
HP ProLiant DL360 G9 Server 2x Xeon E5-2690 V3 24 Cores P440ar 128GB DDR4 1x SSD
$249.99
Dell Poweredge R220 Server Xeon E3-1270 v3 3.5ghz Quad Core / 16gb / 1x Tray
$139.99
Dell R730xd 26 Port SFF 2x E5-2697v4 36-Cores H730 128GB Server 2x SFP 10G ENT
$490.00
DELL PowerEdge R730XD Server 2x E5-2697v4 2.3GHz =36 Cores 32GB H730 4xRJ45
$378.00