I think the MX-10 is a great system in its price range, and with its variable aperture and multiple available lenses, is a big step up from all of the fixed-lens, fixed-aperture point-and-shoots, including the Auto 35. However, its one drawback, which is major, is that the "external" strobe (YS-40) is too close to the lens, creating backscatter. While we do produce the MXTENDER, which solves the MX-10 problem, I DO NOT recommend that option for you. Our device is for the veteran MX-10 photographer who has a lot already invested in their system. Since you don't yet own an MX-10, you could apply the cost of the MXTENDER, plus that of the camera itself, toward a better system. There are many choices available, including digital systems.
In my opinion, the mere fact that the Auto 35 has a nice strobe/arm setup does not make up for the weakness of the camera. The system with strobe is very inexpensive though, about $90.00 less than an MX-10/YS-40 system. If all one wanted was snapshots, and didn't care about additional lenses, the Auto 35 might be a good option, but I find it too limiting.
I agree with Dee that a Motormarine II-EX with YS-60, or even a MM-II/YS-50, is a far better choice than either the MX-10 or Auto 35. With the MM-II, you get a more powerful strobe with TTL metering, and a camera with a wider lens selection. These systems can often be found on the used market at bargain prices.
Others on the board can give you info about the comparably-priced digital setups, I'm sure.
BTW, all but one of the photographs on my website (
http://www.gbundersea.com/photo.htm) were taken using a Motormarine II with single YS-50 strobe. For the other, I used an MX-10 equipped with an MXTENDER.
Good luck!