I just wanted to follow up here since I did receive some direct replies to my inquiry. Josh and QSI Solutions are alive and well, and large scale Titans are available.

I just had a great phone call with Josh, and we spoke about everything from product availability to software engineering to sound engineering to customer support. I've always been impressed with the engineering aspects of QSI--and they continue to get better--so that's never been an issue for me. But selling product is what pays the bills and helps make the engineering efforts all worth it, so I discussed some ideas with Josh about improving customer and reseller support (based on my experiences at a software product company). I'm hopefully that this will help more people be able to obtain and use the products successfully.