Sorry to hear about this... sounds like an awful experience to go through. Obviously have no way to troubleshoot for you remotely but one thing you need to be careful of with the Superfilter is the gain structure. It looks like you are running the filter gain pretty hot, the HPF would probably be okay like that but it is hard to see what mode the second filter is in. I have always avoided bridged mode after reading about people frying their gear but for others it seems to work fine. Could be something totally unrelated to any settings at the amp/filter, though. You have a thread on TalkBass that started out about problems with the DI before the amp blew so there may have been something internally going bad.
I would start by taking the amp to a tech before buying a new amp. As far as speakers if you have something you can use until you find exactly what you want that would be great. There are lots of excellent choices for bass cabinets these days. I got a couple of Barefaced cabinets with 12" drivers recently, a SuperTwin and a Big Baby 2, they sound really good and are amazingly light, very loud, respond well to EQ, and put out tons of low end while still retaining punch. Expensive and hard to find used, all their speakers are made to order so it takes a month or so to get one. When the cabs are finished they ship to the US overnight. My cabinet got to my front door in CA about 21 hours after it was shipped from the UK. The Mesa Subway cabinets are excellent, too, as are the Bergantino cabs, and at least you may be able to find them locally to audition them. So many choices worth taking the time to explore.
