Tssk, lazybones 😉
I'm not that expert on sound cards (and as for all those Rage thingies, unless you have very specific demands, take an AGP 4x universal one, or PCI, or just dump/sell them all)
I'll take a crack at SCSI and networking. Someone else will have to comment on DOS compatibility, but Win9x-onwards I'm pretty up to speed with compatibility & performance.
SCSI:
Symbios Logic SYM20403 - simple 16b ISA SCSI-2 card with narrow HD50 external connector and no bootROM.
Adaptec AHA-1520B - simple 16b ISA SCSI-2 card with internal narrow 50p and external narrow HD50 connector and bootROM
Adaptec AHA-1520B - simple 16b ISA SCSI-2 card with internal narrow 50p and external narrow HD50 connector and bootROM (same specs, different - older - PCB)
Adaptec AHA-2930 - simple 32b PCI SCSI-2 card with internal narrow 50p and external narrow HD50 connector and bootROM (apparently bundled with a Plextor device)
Adaptec AHA-2940UW - 32b PCI UW-SCSI card with narrow internal 50p and wide 68p and external wide HD68 connector and bootROM (Dell-branded)
Adaptec AHA-1510A - simple 16b ISA SCSI-2 card with internal narrow 50p and external narrow Centronics connector and no bootROM.
What's best? Well, depends entirely on your system and what you want to do with it. The AHA-2940UW is the only one of these adapters to offer Ultra-SCSI (higher clock) and Wide-SCSI (wider bus). If you have either Ultra and/or Wide devices (and a PCI bus...) this is the one to go for. The rest are all basic narrow SCSI-2. If you want to boot off SCSI, you need an adapter with a bootROM. If you don't want to boot off SCSI, the bootROM slows boot down, so it's better to have an adapter wihout one (or remove the ROM chip from one that does). Apart from that, just take what fits your bus and the connectors on your device. Nothing really special here.
Network:
I'm not going to list every card here, instead just the chipsets and/or model numbers. Exception: if one of the cards is something special. Also, some pics are too fuzzy to make out the exact chip or model, but nothing I can't identify looks too special.
NetworkEverywhere NC100/Linksys LNE100 - Basic 10/100Mbps PCI Ethernet. I strongly suspect these are relabeled Realtek RTL8139 chips.
Davicom DM9102AF - relabeled SiS900 10/100Mbps PCI Ethernet. Marginally better than the RTL8139 and as supported under DOS, but big issue with default WinXP driver (all NICs with this driver present same - incorrect - MAC address to network) so be sure to install updated drivers if running XP, particularly if you have two or more on your network.
Realtek RTL8139B - completely ubiquitous 10/100Mbps PCI Ethernet chip. Low-end, high CPU impact, but as it's an evolution of the 8029 and 8019 it's basically NE2000 compatible so good DOS support.
Realtek RTL8139C - identical to 8139B except it requires PCI 2.2, so cannot be used with older PCI systems.
Digital DEC 21140 'Tulip' - early but generally very robust and well-supported (anything from DOS to Linux to Alpha/VMS) PCI 10/100Mbps Ethernet chip.
3Com905B-TX - ubiquitous mid-range 10/100Mbps PCI Ethernet
3Com509B-TP - ubiquitous mid-range 10Mbps ISA Ethernet. Various configs available, here one with UTP only, one with UTP and AUI.
Intel 82557 (also known as Intel PRO/100) - Good, reliable PCI 10/100Mbps PCI Ethernet chip frequently seen in servers. Well supported, including DOS.
Intel 82556 (Intel EtherExpress Pro/100) - another Intel workhorse. This card with FCC-ID EJM-NPDPILA8465 looks interesting as it has a high component count and buffer RAM onboard. Can't find out more about it though...
UMC UM9003F - never seen one of these before - is there any kind of PC chip that UMC didn't make in the early 1990s? Quick google shows DOS and Win9x drivers should exist.
- and right in the middle there's an Intel 1Gbps server/workstation PCI NIC I can't read the markings on.
Nothing hugely interesting. In terms of specs, the Intel Gb is obviously the best. As for the 100Mbps performance, Intel, DEC and 3Com should be pretty equivalent with SIS and RTL less interesting. For ISA, the 3Coms are well-known and well-supported, and absolutely no idea how the UMC would perform. But it is the only one with a BNC-connector if you want to do 10Base2. In terms of compatibility, it depends on your OS. Everything should work under Win9x, most will work under DOS, and for everything else, go with either DEC or Intel.
Edit: just had a crazy idea - an all UMC-system, with everything from CPU to motherboard to VGA to I/O to LAN (and sound? probably...) being UMC.