I still use and love gameport-based controllers.
The last Sound Blaster card to have a genuine gameport was the Audigy 2 ZS, and in fact, I just bought one for my latest gaming system from ebay for $30. The gameport is actually a slot bracket, DB-15 port, and a ribbon cable that connects to the joystick/midi pins on the sound blaster card, so make sure the seller has this part before you bid on it. It should have come in the box the sound card came in, but people would tend to toss this part out.
The last sound blaster that had a gameport built onto the card itself (therefore not taking up another "slot cover") is the Audigy LS, which I have on my old system, and it works fine too.
Both are genuine 5.1 surround sound cards with optical out, but the 2ZS has a better processor onboard that will offload CPU cycles.
-Llama