Welcome to CoffeeSnobs,
I agree you dont seem to hear much about the SL70. They should be a capable machine for the money, no idea what support is like for them.
I remember reading one user review on CoffeeGeek some time ago, and the whole review was not encouraging. Most others were very keen on the steaming ability, apparently that is very good, but there seemed to be some reliability issues, cant remember what exactly now. But then even Silvias have the odd problem, however there seems to be plenty of help available for them.
OTOH at similiar price is the Imat mokita, which I know some CSs use and it does a very good job for the price, doesnt seem to have many problems, and the Sunbeam twin thermoblock machine is getting good reports, although there is some issues being sorted out by Sunbeam.
ALSO you dont mention anything about a grinder, but (echo) a good grinder is the 2nd most important item, after fresh beans, for good coffee.
Anyway keep reading, and looking.