I'm nearly there for my ideal IIci setup: Daystar 040, Radius Rocket, and FWB SCSI. The only thing I don't have that I really want is a Radius Thunder IV GX.
I have a Supermac Thunder II GX, but my Radius Rocket doesn't accelerate it. I'm also disappointed that I can't use 16 colors with the card like you can with the Radius Thunder, which breaks several of my games. So I've had to resort back to my little red Radius card.
If I had a IIx, I'd have 3x Radius Rockets, Radius Thunder IV GX, and an FWB SCSI card.
I don't bother with the ethernet card because I have a FastPath IV to convert all my machines' AppleTalk to MacIP, and nothing I have for my vintage Macs warrants needing ethernet. If I have anything that big, I'll just copy it over via my MO drive.
Only way, personally, that I'd even bother with a IIfx is if I stumbled upon a TokaMac 040 upgrade. I'd then pay top dollar for a IIfx.