Break beam eyes aren't needed on the A5 because the cyclone only feeds one ball at a time so it is nearly impossible to load a ball wrong. Oh and it's a mechanical marker.

The cyclone does tend to mash fragile paint especially at higher speeds.
I'm going to agree with tlmiller on the MG-7 from all the reviews it seems to be a solid marker but I've never personally used one. I've tried out the SLG and it is nice enough but I'm not a fan of spool valves.
Expansion chambers are only for CO2.
Carbon fibre tanks are better in every way but price than the metal ones if you can get a 68/4500 filled you should be able to shoot an entire case on one fill. The Viewloader Eye force is a good hopper I bought one but I find it to be too bulky but for the price you can't find a new hopper any better.