A Baratza Virtuoso on its best day isn't up to good espresso use. While they can grind fine enough for an "espresso grind," they don't have the fine control down in that range to allow for the necessary tweaking to get a good cup. A Baratza Preciso is barely entry-level, and barely adequate for an entry level espresso machine.
The real answer to your question starts with a paradigm shift, best expressed in two other questions:
- How much time and trouble are you willing to expend chasing really good coffee? And
- How much can you possibly afford, with a lot of kicking, screaming, and a wide allowance for a guilty conscious, to spend?
The already recommended FAQ is a good place to start.
With a little bit of luck you can draw a very good to excellent shot using entry and mid level equipment. However, the more you spend on a grinder and espresso machine the less luck dependent you become; the more consistent you become; and the higher your limits on absolute quality. So, that's where the money goes -- control, consistency and excellence.
At the risk of jumping too far ahead, if and when you consider a new espresso machine don't buy a Silvia. A lot of people got their start with Silvias, a lot of people use and adore them; but it's an idea whose time has passed. Don't waste your time on a Silvia or any other "single boiler dual use" (SBDU) machine unless you NEVER make milk drinks, and are willing to pay extra for a PID.
No super automatics (i.e. machines which include a grinder which automatically dispenses into the pf, if for no other reason than the grind path gets humid, clogged, filthy and rancid. Yum. Actually, I was "of counsel to Filthy & Rancid but that's another story.
Also, the conventional wisdom that the grinder is more important than the machine isn't quite right. Both have to be of an adequate level and should be appropriate to one another. It's true that more people underestimate the importance and cost of an appropriate grinder than underestimate the cost of a desirable appropriate machine, but that's a different matter -- and more sticker shock than anything else. A fellow gets the idea that a $1200 machine will make every morning paradise, but is dismayed to find that heaven's cover charge requires another $500 for the grinder.
You'll probably spend something greater than 1/3 the cost of the machine for the grinder; but there are no hard and fast rules or percentages. Everything is very contingent on everything else.
If you want really good coffee, get used to the concept that it's going to take some effort and beaucoup bucks.
Good luck,
BDL