Curse is a great region to run missions of all levels. Most L1 missions for Angel and Serpentis are in quiet systems and you even have some L4 agents in lesser used systems. Additionally, certain L4 missions rarely leave their agent system, which means you can run them easily in BS. I like my Dominix for Security L4s. Another great advantage of Curse is that it has stations in a lot of the systems, which means you can put a BS and other ships in each system around your preferred agent(s) and run missions even if they go out of system.
The same principle can be applied to Stain. Syndicate is a great region for mission running for Intaki as well.
Using blinged ships is something I am generally not a fan of. They paint a big Find Me mark on your back and that is something you really do not like to have. People have tried to find and engage my Dominix but I have heard from a few scanners they are not particularly intrigued by a T1 BS when they can have Marauders and pirate BS instead.
You should be aware of that there are several groups living in both regions. For instance, Fraternity is running missions on a massive scale around the OSY area. Unless you can broker a deal with them, you won’t be able to accomplish much there. Stain also has several groups like Ferrata Victrix, which will also hunt you.