Unfortunatly, the Bell and Howells I have don't have manual exposure ( I wish they did) but they work like a charm...
Do you know what model your cameras are? I'll look it up on Google. The only Super-8 camera I have is a Sankyo Sound XL-40S. It's mostly plastic, but seems like a great camera and has a really nice heavy, solid feel to it. I really liked it because it does have a manual aperture. It uses TTL auto exposure, but your can turn a dial to change the f-stop manually. It also has a powered zoom lens...that actually works! I haven't filmed with it yet, but I did put batteries in, and everything seems to work. The shutter works and the film advance turns, and even the power zoom works. I just might have to get a Super-8 cartridge and finally try it out.
And I bought it at an antique shop for $20
If anyone wants to try Regular 8mm film, the camera I would definitely recommend is a Bolex K2. It's awesome. Very solidly built, super sharp lens, and you can use either auto exposure or completely manual exposure. It has an adjustable shutter too, so you can also change the shutter speed. I've shot several rolls with that camera and it's great. I do see them show up on eBay once in a while.
Oh, and Filmamigo...I looked up your camera on Google. Very nice! If I do get more interested in Super-8 (and can afford that camera, because I'm sure it still sells for a lot), then that looks like something I would like eventually.