Yep you got the opticals if they're 48-way. Nice thing is if you don't really care for the whole 48 way thing, you can switch them out for 8-ways and theres a DIP switch on the board to change the game to 8-way sticks. (You may have to run wires from the harness for your 4 directions per player however) I'm not a huge Blitz fan so this might be opinionated, but I have a Blitz 2k Gold and i've played it with 8-way sticks and honestly I don't think it's much of a difference.
Check the model on your monitor, maybe you got lucky and have a dual res NeoTec or something. If you can do low res (15khz) then you're set to plug any other jamma title in there and use 8 way sticks for that. Otherwise if its mid res (24khz) only, then only other games are going to be Gauntlet Legends/Dark Legacy like previous poster said. Also- Blitz can be switched to run in low res as well if you were to swap monitors.
Anyone else think of any other med res jamma titles off the top of their head? I can't at the moment.