Get this one if you are ever going to buy an espresso machine. Even if you just use this grinder for French Press or drip, the doser is a big help.
Buy the grinder first and I would strongly suggest one with a doser. No opinion on which machine to buy. Really depends on your budget. Silvia will get you going, but some of the 1000-1500 machines are real nice. The temp's and pressure are more steady.
A friend of mine has the Mazzer without the doser and it's a pain to fill the portafilter and very messy. You'll find making espresso a dirty job in general.