I've always used and recommended MSD stuff. Just recently I started using some Mallory boxes. I also have a FAST XFI system. I was pricing parts when setting up my 440 Dakota and discovered that I could get a Mallory box with more features dollar for dollar when compared to MSD. I was originally going to use a 6AL box, but opted for a Mallory
Mallory Hyfire IV digital box. I believe i set the rev limiter in the box a bit higher than the XFI limiter, just as a back up. I went with this box instead of one with no rev limiter because I can use it as a spare for other cars if needed. I went with a Mallory distributor and coil too.